Incumbents defeated in state legislative elections, 2018

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Last updated on November 18, 2024

There were 6,065 state legislative seats up for election on November 6, 2018, in 46 states. This page analyzes incumbents defeated in those elections. An incumbent may be defeated at two points in an election cycle: during a primary and during a general election.

In 2018, 484 incumbents lost their re-election bids: 318 in general elections and 166 in primaries. This was more than in 2016 (362) and 2014 (382) but equal to 2012 (484).

On this page, you will find:

• Incumbents defeated in general elections
• Incumbents defeated in primaries
• State-by-state breakdowns

Incumbents defeated in general elections

In state legislative general elections, 318 incumbents lost to challengers, 6.8% of incumbents running for re-election. This was the largest number of incumbents defeated in even-year general elections since 2010 (495).

In 2018 general elections:

51 Democratic incumbents lost, 2.4% of the 2,096 Democratic incumbents who ran.

255 Republican incumbents lost, 9.9% of the 2,581 Republican incumbents who ran.

12 minor party or independent incumbents lost, 50.0% of the 24 minor party or independent incumbents who ran.

The total number of incumbents defeated in general elections—318—was a 34% increase from 2016 (237).

In 2018

Click [show] on the table below to view general election incumbent defeat statistics by state in 2018. Hover over column headings to learn more about their contents.

State legislative incumbents defeated in general elections, 2018
State
	Democratic			Republican			Total
	Filed	Def.	%	Filed	Def.	%	Filed	Def.	%
Nationwide	2,096	51	2.4%	2,581	255	9.9%	4,701	318	6.8%
Alabama	31	1	3.2%	70	0	0.0%	101	1	1.0%
Alaska	14	1	7.1%	20	1	5.0%	36	3	8.3%
Arizona	23	0	0.0%	31	3	9.7%	54	3	5.6%
Arkansas	20	2	10.0%	70	2	2.9%	91	5	5.5%
California	61	0	0.0%	27	5	18.5%	88	5	5.7%
Colorado	27	0	0.0%	26	4	15.4%	53	4	7.5%
Connecticut	82	0	0.0%	79	15	19.0%	161	15	9.3%
Delaware	20	0	0.0%	16	2	12.5%	36	2	5.6%
Florida	37	2	5.4%	62	4	6.5%	99	6	6.1%
Georgia	78	2	2.6%	129	8	6.2%	207	10	4.8%
Hawaii	47	0	0.0%	4	0	0.0%	51	0	0.0%
Idaho	14	0	0.0%	69	5	7.2%	83	5	6.0%
Illinois	75	1	1.3%	55	9	16.4%	130	10	7.7%
Indiana	28	0	0.0%	81	4	4.9%	109	4	3.7%
Iowa	46	2	4.3%	55	5	9.1%	101	7	6.9%
Kansas	40	5	12.5%	65	3	4.6%	105	8	7.6%
Kentucky	28	3	10.7%	66	6	9.1%	94	9	9.6%
Maine	73	1	1.4%	50	9	18.0%	126	11	8.7%
Maryland	83	1	1.2%	53	7	13.2%	136	8	5.9%
Massachusetts	134	0	0.0%	37	2	5.4%	173	3	1.7%
Michigan	30	0	0.0%	45	3	6.7%	75	3	4.0%
Minnesota	41	0	0.0%	69	15	21.7%	110	15	13.6%
Missouri	33	1	3.0%	82	2	2.4%	115	3	2.6%
Montana	34	0	0.0%	53	3	5.7%	87	3	3.4%
Nebraska	3	0	0.0%	12	2	16.7%	16	3	18.8%
Nevada	24	0	0.0%	13	2	15.4%	37	2	5.4%
New Hampshire	141	6	4.3%	159	43	27.0%	303	52	17.2%
New Mexico	32	1	3.1%	26	6	23.1%	58	7	12.1%
New York	121	3	2.5%	63	8	12.7%	185	11	5.9%
North Carolina	54	2	3.7%	92	14	15.2%	146	16	11.0%
North Dakota	11	0	0.0%	48	4	8.3%	59	4	6.8%
Ohio	24	0	0.0%	50	1	2.0%	74	1	1.4%
Oklahoma	22	3	13.6%	48	0	0.0%	70	3	4.3%
Oregon	41	0	0.0%	23	3	13.0%	64	3	4.7%
Pennsylvania	78	2	2.6%	111	10	9.0%	189	12	6.3%
Rhode Island	83	1	1.2%	12	3	25.0%	95	4	4.2%
South Carolina	39	1	2.6%	72	2	2.8%	111	3	2.7%
South Dakota	9	1	11.1%	67	3	4.5%	76	4	5.3%
Tennessee	19	0	0.0%	66	1	1.5%	85	1	1.2%
Texas	52	0	0.0%	90	10	11.1%	142	10	7.0%
Utah	14	0	0.0%	53	1	1.9%	67	1	1.5%
Vermont	91	1	1.1%	44	6	13.6%	145	10	6.9%
Washington	58	1	1.7%	46	8	17.4%	104	9	8.7%
West Virginia	37	4	10.8%	56	9	16.1%	94	14	14.9%
Wisconsin	35	1	2.9%	63	0	0.0%	98	1	1.0%
Wyoming	9	2	22.2%	53	2	3.8%	62	4	6.5%

Historical comparison

The chart below shows a partisan breakdown of incumbents defeated in general elections from 2010 to 2018.

Click [show] on the table below to view general election incumbent defeat statistics by state from 2010 to 2018. Hover over column headings to learn more about their contents.

State legislative incumbents defeated in general elections, 2010-2018
State
	2010		2012		2014		2016		2018
	Def.	%	Def.	%	Def.	%	Def.	%	Def.	%
Nationwide	495	10.2%	287	6.3%	251	5.1%	237	5.0%	318	6.8%
Alabama	22	19.5%	-	-	4	3.6%	-	-	1	1.0%
Alaska	3	6.7%	9	17.3%	1	2.2%	2	5.6%	3	8.3%
Arizona	6	12.8%	4	7.0%	2	3.1%	4	6.7%	3	5.6%
Arkansas	6	9.5%	6	7.1%	10	12.0%	6	6.1%	5	5.5%
California	0	0.0%	3	5.4%	4	6.0%	5	6.8%	5	5.7%
Colorado	7	10.9%	4	7.8%	6	10.2%	4	7.0%	4	7.5%
Connecticut	13	7.8%	4	2.5%	10	6.2%	10	6.2%	15	9.3%
Delaware	3	6.4%	3	6.0%	2	4.3%	1	2.0%	2	5.6%
Florida	5	5.3%	5	4.7%	5	4.1%	3	3.1%	6	6.1%
Georgia	3	1.6%	3	1.5%	0	0.0%	4	1.9%	10	4.8%
Hawaii	1	1.8%	3	4.5%	0	0.0%	2	3.3%	0	0.0%
Idaho	2	2.2%	2	3.0%	2	2.3%	2	2.2%	5	6.0%
Illinois	7	5.6%	5	3.6%	1	0.8%	6	4.2%	10	7.7%
Indiana	10	9.0%	5	4.9%	6	5.2%	1	1.0%	4	3.7%
Iowa	18	17.1%	8	8.3%	5	4.6%	7	6.4%	7	6.9%
Kansas	13	11.8%	14	13.1%	3	2.8%	11	9.4%	8	7.6%
Kentucky	8	7.3%	4	3.8%	4	3.8%	18	16.8%	9	9.6%
Maine	20	14.4%	17	14.0%	13	10.2%	13	8.8%	11	8.7%
Maryland	3	2.0%	-	-	7	5.6%	-	-	8	5.9%
Massachusetts	10	6.1%	2	1.1%	3	1.7%	0	0.0%	3	1.7%
Michigan	9	13.2%	5	5.7%	2	2.1%	1	1.5%	3	4.0%
Minnesota	34	19.4%	16	10.5%	11	9.2%	11	6.5%	15	13.6%
Missouri	12	11.8%	6	5.1%	5	3.4%	1	0.7%	3	2.6%
Montana	10	13.7%	8	10.1%	6	7.9%	5	6.5%	3	3.4%
Nebraska	2	9.5%	1	6.3%	0	0.0%	5	38.5%	3	18.8%
Nevada	2	8.0%	1	2.9%	7	16.3%	7	17.9%	2	5.4%
New Hampshire	88	28.3%	78	26.6%	46	15.1%	23	7.7%	52	17.2%
New Mexico	7	10.8%	8	9.4%	6	10.3%	8	7.8%	7	12.1%
New York	11	6.0%	4	2.1%	4	2.1%	2	1.1%	11	5.9%
North Carolina	20	13.7%	6	5.1%	5	3.2%	6	3.9%	16	11.0%
North Dakota	12	21.1%	6	10.5%	3	5.1%	17	32.7%	4	6.8%
Ohio	13	15.1%	2	2.0%	3	3.5%	1	1.1%	1	1.4%
Oklahoma	6	5.9%	0	0.0%	1	1.1%	0	0.0%	3	4.3%
Oregon	4	5.9%	4	6.3%	2	3.4%	0	0.0%	3	4.7%
Pennsylvania	9	4.3%	1	0.5%	4	2.0%	6	2.9%	12	6.3%
Rhode Island	4	4.5%	4	4.3%	7	6.9%	2	2.0%	4	4.2%
South Carolina	3	2.8%	2	1.4%	1	0.9%	0	0.0%	3	2.7%
South Dakota	9	13.0%	4	6.1%	3	4.1%	2	3.3%	4	5.3%
Tennessee	13	12.5%	2	2.3%	2	2.1%	2	1.9%	1	1.2%
Texas	21	13.9%	3	2.2%	2	1.4%	5	3.5%	10	7.0%
Utah	6	7.6%	2	2.9%	1	1.4%	2	2.6%	1	1.5%
Vermont	6	3.8%	6	3.9%	11	7.2%	10	6.6%	10	6.9%
Washington	9	8.8%	3	3.1%	4	3.6%	3	2.9%	9	8.7%
West Virginia	5	5.1%	8	8.3%	23	23.5%	14	15.6%	14	14.9%
Wisconsin	13	14.1%	5	5.4%	3	3.4%	2	2.0%	1	1.0%
Wyoming	7	11.7%	1	1.8%	1	1.7%	3	5.7%	4	6.5%

Incumbents defeated in primaries

In state legislative primaries, 166 incumbents lost to challengers, 3.4% of incumbents running for re-election. This was more than in 2016 (125) and 2014 (131) but less than in 2012 (197).

In 2018 primaries:

78 Democratic incumbents lost, 3.6% of the 2,174 Democratic incumbents who ran.

88 Republican incumbents lost, 3.3% of the 2,671 Republican incumbents who ran.

The total number of incumbents defeated in primaries—166—was a 33% increase from 2016 (125).

In 2018

Click [show] on the table below to view primary incumbent defeat statistics by state in 2018. Hover over column headings to learn more about their contents.

State legislative incumbents defeated in primaries, 2018
State
	Democratic			Republican			Total
	Filed	Def.	%	Filed	Def.	%	Filed	Def.	%
Nationwide	2,174	78	3.6%	2,671	88	3.3%	4,874	166	3.4%
Alabama	32	1	3.1%	70	1	1.4%	102	2	2.0%
Alaska	14	0	0.0%	21	1	4.8%	37	1	2.7%
Arizona	24	1	4.2%	33	2	6.1%	57	3	5.3%
Arkansas	21	0	0.0%	73	3	4.1%	95	3	3.2%
California	59	0	0.0%	27	0	0.0%	86	0	0.0%
Colorado	27	0	0.0%	30	2	6.7%	57	2	3.5%
Connecticut	84	2	2.4%	79	0	0.0%	163	2	1.2%
Delaware	21	1	4.8%	16	0	0.0%	37	1	2.7%
Florida	39	2	5.1%	63	0	0.0%	102	2	2.0%
Georgia	82	4	4.9%	134	5	3.7%	216	9	4.2%
Hawaii	50	3	6.0%	4	0	0.0%	54	3	5.6%
Idaho	14	0	0.0%	75	6	8.0%	89	6	6.7%
Illinois	77	2	2.6%	52	1	1.9%	129	3	2.3%
Indiana	28	0	0.0%	83	2	2.4%	111	2	1.8%
Iowa	48	0	0.0%	55	0	0.0%	103	0	0.0%
Kansas	40	0	0.0%	72	7	9.7%	112	7	6.3%
Kentucky	29	1	3.4%	69	3	4.3%	98	4	4.1%
Maine	74	0	0.0%	53	0	0.0%	130	0	0.0%
Maryland	95	12	12.6%	54	1	1.9%	149	13	8.7%
Massachusetts	137	3	2.2%	37	0	0.0%	176	3	1.7%
Michigan	32	2	6.3%	46	1	2.2%	78	3	3.8%
Minnesota	41	0	0.0%	70	1	1.4%	111	1	0.9%
Missouri	34	1	2.9%	83	0	0.0%	117	1	0.9%
Montana	34	0	0.0%	55	1	1.8%	89	1	1.1%
Nebraska	3	0	0.0%	12	0	0.0%	16	0	0.0%
Nevada	24	0	0.0%	14	1	7.1%	38	1	2.6%
New Hampshire	147	6	4.1%	170	11	6.5%	320	17	5.3%
New Mexico	35	3	8.6%	26	0	0.0%	61	3	4.9%
New York	131	9	6.9%	64	1	1.6%	195	10	5.1%
North Carolina	57	3	5.3%	96	5	5.2%	153	8	5.2%
North Dakota	11	0	0.0%	49	1	2.0%	60	1	1.7%
Ohio	25	0	0.0%	49	1	2.0%	74	1	1.4%
Oklahoma	22	0	0.0%	60	12	20.0%	82	12	14.6%
Oregon	42	1	2.4%	23	1	4.3%	65	2	3.1%
Pennsylvania	82	3	3.7%	114	1	0.9%	196	4	2.0%
Rhode Island	86	3	3.5%	12	0	0.0%	98	3	3.1%
South Carolina	42	3	7.1%	74	2	2.7%	116	5	4.3%
South Dakota	9	0	0.0%	70	0	0.0%	79	0	0.0%
Tennessee	20	1	5.0%	69	2	2.9%	89	3	3.4%
Texas	57	5	8.8%	94	4	4.3%	151	9	6.0%
Utah	14	0	0.0%	51	0	0.0%	65	0	0.0%
Vermont	88	2	2.3%	44	1	2.3%	148	3	2.0%
Washington	59	1	1.7%	47	1	2.1%	106	2	1.9%
West Virginia	38	1	2.6%	60	4	6.7%	99	5	5.1%
Wisconsin	37	2	5.4%	63	0	0.0%	100	2	2.0%
Wyoming	9	0	0.0%	56	3	5.4%	65	3	4.6%

Historical comparison

The chart below shows a partisan breakdown of incumbents defeated in primaries from 2010 to 2018.

Click [show] on the table below to view primary incumbent defeat statistics by state from 2010 to 2018. Hover over column headings to learn more about their contents.

State legislative incumbents defeated in primaries, 2010-2018
State
	2010		2012		2014		2016		2018
	Def.	%	Def.	%	Def.	%	Def.	%	Def.	%
Nationwide	116	2.3%	197	4.1%	131	2.6%	125	2.6%	166	3.4%
Alabama	6	5.0%	-	-	8	6.7%	-	-	2	2.0%
Alaska	0	0.0%	2	3.7%	2	4.3%	5	12.2%	1	2.7%
Arizona	4	7.8%	3	5.0%	2	3.0%	4	6.3%	3	5.3%
Arkansas	1	1.6%	2	2.3%	4	4.6%	2	2.0%	3	3.2%
California	0	0.0%	0	0.0%	0	0.0%	0	0.0%	0	0.0%
Colorado	0	0.0%	2	3.8%	0	0.0%	2	3.4%	2	3.5%
Connecticut	1	0.6%	4	2.5%	2	1.2%	2	1.2%	2	1.2%
Delaware	1	2.1%	3	5.7%	2	4.1%	0	0.0%	1	2.7%
Florida	1	1.0%	3	2.7%	1	0.8%	0	0.0%	2	2.0%
Georgia	5	2.5%	12	5.7%	7	3.2%	5	2.3%	9	4.2%
Hawaii	1	1.7%	5	7.0%	3	5.2%	1	1.6%	3	5.6%
Idaho	6	6.3%	3	4.3%	6	6.4%	7	7.3%	6	6.7%
Illinois	1	0.8%	6	4.1%	3	2.4%	1	0.7%	3	2.3%
Indiana	2	1.8%	0	0.0%	3	2.6%	2	1.9%	2	1.8%
Iowa	2	1.9%	3	3.0%	0	0.0%	1	0.9%	0	0.0%
Kansas	5	4.3%	20	15.7%	3	2.7%	15	11.4%	7	6.3%
Kentucky	2	1.8%	1	0.9%	2	1.9%	2	1.8%	4	4.1%
Maine	1	0.7%	0	0.0%	0	0.0%	1	0.7%	0	0.0%
Maryland	11	6.8%	-	-	12	8.7%	-	-	13	8.7%
Massachusetts	1	0.6%	4	2.1%	1	0.6%	2	1.1%	3	1.7%
Michigan	0	0.0%	5	5.4%	1	1.0%	0	0.0%	3	3.8%
Minnesota	2	1.1%	1	0.6%	0	0.0%	4	2.3%	1	0.9%
Missouri	3	2.9%	8	6.3%	0	0.0%	4	2.8%	1	0.9%
Montana	2	2.7%	4	4.9%	2	2.5%	2	2.5%	1	1.1%
Nebraska	0	0.0%	0	0.0%	0	0.0%	1	7.1%	0	0.0%
Nevada	1	3.8%	2	5.6%	0	0.0%	2	4.9%	1	2.6%
New Hampshire	11	3.4%	22	7.0%	9	2.9%	10	3.3%	17	5.3%
New Mexico	2	3.0%	5	5.5%	2	3.4%	1	1.0%	3	4.9%
New York	4	2.1%	2	1.1%	2	1.0%	3	1.5%	10	5.1%
North Carolina	5	3.3%	7	5.5%	4	2.6%	2	1.3%	8	5.2%
North Dakota	0	0.0%	4	6.6%	0	0.0%	2	3.7%	1	1.7%
Ohio	1	1.1%	1	1.0%	3	3.3%	1	1.2%	1	1.4%
Oklahoma	1	1.0%	1	1.0%	0	0.0%	3	3.6%	12	14.6%
Oregon	0	0.0%	2	3.0%	1	1.7%	0	0.0%	2	3.1%
Pennsylvania	1	0.5%	5	2.5%	6	3.0%	4	1.9%	4	2.0%
Rhode Island	10	10.2%	6	6.0%	3	2.9%	6	5.7%	3	3.1%
South Carolina	5	4.5%	5	3.4%	2	1.7%	9	5.9%	5	4.3%
South Dakota	1	1.4%	5	6.8%	0	0.0%	2	3.2%	0	0.0%
Tennessee	2	1.9%	12	12.2%	8	7.7%	2	1.8%	3	3.4%
Texas	7	4.5%	11	7.5%	11	7.3%	5	3.3%	9	6.0%
Utah	2	2.5%	8	10.3%	3	3.9%	3	3.9%	0	0.0%
Vermont	0	0.0%	0	0.0%	1	0.7%	1	0.7%	3	2.0%
Washington	1	1.0%	1	1.0%	1	0.9%	1	1.0%	2	1.9%
West Virginia	3	2.9%	2	2.0%	7	6.6%	2	2.2%	5	5.1%
Wisconsin	1	1.1%	2	2.1%	0	0.0%	0	0.0%	2	2.0%
Wyoming	0	0.0%	3	5.0%	4	6.3%	3	5.5%	3	4.6%

Alabama

General election defeats

There were 140 seats up for election in Alabama. Overall, 101 incumbents advanced to the general election, including 31 Democrats and 70 Republicans. Of that total, one Democratic incumbent lost, representing 1.0% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Alabama, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	24	1	4.2%	54	0	0.0%	78	1	1.3%
Senate	7	0	0.0%	16	0	0.0%	23	0	0.0%
Total	31	1	3.2%	70	0	0.0%	101	1	1.0%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Alabama, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	65	21	32.3%	47	1	2.1%	113	22	19.5%
2012	Did not hold elections.
2014	41	4	9.8%	69	0	0.0%	111	4	3.6%
2016	Did not hold elections.
2018	31	1	3.2%	70	0	0.0%	101	1	1.0%

Primary defeats

There were 140 seats up for election in Alabama. Overall, 102 incumbents filed for re-election, including 32 Democrats and 70 Republicans. Of that total, two incumbents lost in primaries—one Democrat and one Republican—representing 2.0% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Alabama, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	25	15	1	4.0%	53	14	0	0.0%	78	29	1	1.3%
Senate	7	2	0	0.0%	17	5	1	5.9%	24	7	1	4.2%
Total	32	17	1	3.1%	70	19	1	1.4%	102	36	2	2.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Alabama, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	69	21	3	4.3%	51	13	3	5.9%	121	34	6	5.0%
2012	Did not hold elections.
2014	42	13	1	2.4%	76	27	7	9.2%	119	40	8	6.7%
2016	Did not hold elections.
2018	32	17	1	3.1%	70	19	1	1.4%	102	36	2	2.0%

Alaska

General election defeats

There were 50 seats up for election in Alaska. Overall, 36 incumbents advanced to the general election, including 14 Democrats, 20 Republicans, and two independents. Of that total, three incumbents lost—one Democrat, one Republican, and one independent—representing 8.3% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Alaska, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	13	1	7.7%	15	0	0.0%	30	2	6.7%
Senate	1	0	0.0%	5	1	20.0%	6	1	16.7%
Total	14	1	7.1%	20	1	5.0%	36	3	8.3%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Alaska, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	22	2	9.1%	23	1	4.3%	45	3	6.7%
2012	21	6	28.6%	30	2	6.7%	52	9	17.3%
2014	18	0	0.0%	27	1	3.7%	45	1	2.2%
2016	16	0	0.0%	19	2	10.5%	36	2	5.6%
2018	14	1	7.1%	20	1	5.0%	36	3	8.3%

Primary defeats

There were 50 seats up for election in Alaska. Overall, 37 incumbents filed for re-election, including 14 Democrats and 21 Republicans. Of that total, one Republican incumbent lost in a primary, representing 2.7% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Alaska, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	13	0	0	0.0%	16	9	1	6.3%	31	9	1	3.2%
Senate	1	0	0	0.0%	5	2	0	0.0%	6	2	0	0.0%
Total	14	0	0	0.0%	21	11	1	4.8%	37	11	1	2.7%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Alaska, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	22	1	0	0.0%	23	5	0	0.0%	45	6	0	0.0%
2012	21	3	0	0.0%	32	13	2	6.3%	54	16	2	3.7%
2014	18	1	0	0.0%	29	3	2	6.9%	47	4	2	4.3%
2016	18	2	2	11.1%	22	10	3	13.6%	41	12	5	12.2%
2018	14	0	0	0.0%	21	11	1	4.8%	37	11	1	2.7%

Arizona

General election defeats

There were 90 seats up for election in Arizona. Overall, 54 incumbents advanced to the general election, including 23 Democrats and 31 Republicans. Of that total, three Republican incumbents lost, representing 5.6% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Arizona, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	15	0	0.0%	23	3	13.0%	38	3	7.9%
Senate	8	0	0.0%	8	0	0.0%	16	0	0.0%
Total	23	0	0.0%	31	3	9.7%	54	3	5.6%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Arizona, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	19	6	31.6%	28	0	0.0%	47	6	12.8%
2012	17	0	0.0%	40	4	10.0%	57	4	7.0%
2014	26	1	3.8%	38	1	2.6%	64	2	3.1%
2016	23	2	8.7%	37	2	5.4%	60	4	6.7%
2018	23	0	0.0%	31	3	9.7%	54	3	5.6%

Primary defeats

There were 90 seats up for election in Arizona. Overall, 57 incumbents filed for re-election, including 24 Democrats and 33 Republicans. Of that total, three incumbents lost in primaries—one Democrat and two Republicans—representing 5.3% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Arizona, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	16	7	1	6.3%	25	15	2	8.0%	41	22	3	7.3%
Senate	8	1	0	0.0%	8	4	0	0.0%	16	5	0	0.0%
Total	24	8	1	4.2%	33	19	2	6.1%	57	27	3	5.3%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Arizona, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	20	7	1	5.0%	31	19	3	9.7%	51	26	4	7.8%
2012	17	11	0	0.0%	43	13	3	7.0%	60	24	3	5.0%
2014	27	6	1	3.7%	39	22	1	2.6%	66	28	2	3.0%
2016	26	11	3	11.5%	38	8	1	2.6%	64	19	4	6.3%
2018	24	8	1	4.2%	33	19	2	6.1%	57	27	3	5.3%

Arkansas

General election defeats

There were 118 seats up for election in Arkansas. Overall, 91 incumbents advanced to the general election, including 20 Democrats, 70 Republicans, and one independent. Of that total, five incumbents lost—two Democrats, two Republicans, and one independent—representing 5.5% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Arkansas, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	16	2	12.5%	62	2	3.2%	79	5	6.3%
Senate	4	0	0.0%	8	0	0.0%	12	0	0.0%
Total	20	2	10.0%	70	2	2.9%	91	5	5.5%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Arkansas, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	41	6	14.6%	22	0	0.0%	63	6	9.5%
2012	38	3	7.9%	47	3	6.4%	85	6	7.1%
2014	43	10	23.3%	40	0	0.0%	83	10	12.0%
2016	34	6	17.6%	64	0	0.0%	98	6	6.1%
2018	20	2	10.0%	70	2	2.9%	91	5	5.5%

Primary defeats

There were 118 seats up for election in Arkansas. Overall, 95 incumbents filed for re-election, including 21 Democrats and 73 Republicans. Of that total, three Republican incumbents lost in primaries, representing 3.2% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Arkansas, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	17	2	0	0.0%	63	9	1	1.6%	81	11	1	1.2%
Senate	4	2	0	0.0%	10	2	2	20.0%	14	4	2	14.3%
Total	21	4	0	0.0%	73	11	3	4.1%	95	15	3	3.2%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Arkansas, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	42	3	1	2.4%	22	1	0	0.0%	64	4	1	1.6%
2012	40	6	1	2.5%	48	6	1	2.1%	88	12	2	2.3%
2014	44	1	1	2.3%	43	7	3	7.0%	87	8	4	4.6%
2016	36	2	1	2.8%	66	8	1	1.5%	102	10	2	2.0%
2018	21	4	0	0.0%	73	11	3	4.1%	95	15	3	3.2%

California

General election defeats

There were 100 seats up for election in California. Overall, 88 incumbents advanced to the general election, including 61 Democrats and 27 Republicans. Of that total, five Republican incumbents lost, representing 5.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in California, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	53	0	0.0%	22	3	13.6%	75	3	4.0%
Senate	8	0	0.0%	5	2	40.0%	13	2	15.4%
Total	61	0	0.0%	27	5	18.5%	88	5	5.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in California, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	44	0	0.0%	18	0	0.0%	62	0	0.0%
2012	36	2	5.6%	20	1	5.0%	56	3	5.4%
2014	45	4	8.9%	22	0	0.0%	67	4	6.0%
2016	51	2	3.9%	23	3	13.0%	74	5	6.8%
2018	61	0	0.0%	27	5	18.5%	88	5	5.7%

Primary defeats

There were 100 seats up for election in California. Overall, 86 incumbents filed for re-election, including 59 Democrats and 27 Republicans. No incumbents who filed for re-election lost in primaries.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in California, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	51	20	0	0.0%	22	8	0	0.0%	73	28	0	0.0%
Senate	8	5	0	0.0%	5	4	0	0.0%	13	9	0	0.0%
Total	59	25	0	0.0%	27	12	0	0.0%	86	37	0	0.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in California, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	44	3	0	0.0%	18	3	0	0.0%	62	6	0	0.0%
2012	36	15	0	0.0%	20	7	0	0.0%	56	22	0	0.0%
2014	45	19	0	0.0%	22	4	0	0.0%	67	23	0	0.0%
2016	51	15	0	0.0%	23	10	0	0.0%	74	25	0	0.0%
2018	59	25	0	0.0%	27	12	0	0.0%	86	37	0	0.0%

Colorado

General election defeats

There were 82 seats up for election in Colorado. Overall, 53 incumbents advanced to the general election, including 27 Democrats and 26 Republicans. Of that total, four Republican incumbents lost, representing 7.5% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Colorado, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	25	0	0.0%	19	2	10.5%	44	2	4.5%
Senate	2	0	0.0%	7	2	28.6%	9	2	22.2%
Total	27	0	0.0%	26	4	15.4%	53	4	7.5%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Colorado, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	37	6	16.2%	26	0	0.0%	64	7	10.9%
2012	29	0	0.0%	22	4	18.2%	51	4	7.8%
2014	36	4	11.1%	23	2	8.7%	59	6	10.2%
2016	26	0	0.0%	31	4	12.9%	57	4	7.0%
2018	27	0	0.0%	26	4	15.4%	53	4	7.5%

Primary defeats

There were 82 seats up for election in Colorado. Overall, 57 incumbents filed for re-election, including 27 Democrats and 30 Republicans. Of that total, two Republican incumbents lost in primaries, representing 3.5% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Colorado, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	25	0	0	0.0%	23	4	2	8.7%	48	4	2	4.2%
Senate	2	0	0	0.0%	7	1	0	0.0%	9	1	0	0.0%
Total	27	0	0	0.0%	30	5	2	6.7%	57	5	2	3.5%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Colorado, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	37	1	0	0.0%	26	0	0	0.0%	64	1	0	0.0%
2012	29	1	0	0.0%	24	3	2	8.3%	53	4	2	3.8%
2014	36	0	0	0.0%	23	2	0	0.0%	59	2	0	0.0%
2016	26	0	0	0.0%	33	5	2	6.1%	59	5	2	3.4%
2018	27	0	0	0.0%	30	5	2	6.7%	57	5	2	3.5%

Connecticut

General election defeats

There were 187 seats up for election in Connecticut. Overall, 161 incumbents advanced to the general election, including 82 Democrats and 79 Republicans. Of that total, 15 Republican incumbents lost, representing 9.3% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Connecticut, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	68	0	0.0%	64	11	17.2%	132	11	8.3%
Senate	14	0	0.0%	15	4	26.7%	29	4	13.8%
Total	82	0	0.0%	79	15	19.0%	161	15	9.3%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Connecticut, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	123	13	10.6%	44	0	0.0%	167	13	7.8%
2012	100	1	1.0%	59	3	5.1%	159	4	2.5%
2014	103	9	8.7%	58	1	1.7%	161	10	6.2%
2016	94	8	8.5%	68	2	2.9%	162	10	6.2%
2018	82	0	0.0%	79	15	19.0%	161	15	9.3%

Primary defeats

There were 187 seats up for election in Connecticut. Overall, 163 incumbents filed for re-election, including 84 Democrats and 79 Republicans. Of that total, two Democratic incumbents lost in primaries, representing 1.2% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Connecticut, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	70	5	2	2.9%	64	0	0	0.0%	134	5	2	1.5%
Senate	14	0	0	0.0%	15	0	0	0.0%	29	0	0	0.0%
Total	84	5	2	2.4%	79	0	0	0.0%	163	5	2	1.2%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Connecticut, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	124	10	1	0.8%	44	0	0	0.0%	168	10	1	0.6%
2012	104	6	4	3.8%	59	1	0	0.0%	163	7	4	2.5%
2014	105	8	2	1.9%	58	1	0	0.0%	163	9	2	1.2%
2016	96	8	2	2.1%	68	2	0	0.0%	164	10	2	1.2%
2018	84	5	2	2.4%	79	0	0	0.0%	163	5	2	1.2%

Delaware

General election defeats

There were 51 seats up for election in Delaware. Overall, 36 incumbents advanced to the general election, including 20 Democrats and 16 Republicans. Of that total, two Republican incumbents lost, representing 5.6% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Delaware, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	18	0	0.0%	12	1	8.3%	30	1	3.3%
Senate	2	0	0.0%	4	1	25.0%	6	1	16.7%
Total	20	0	0.0%	16	2	12.5%	36	2	5.6%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Delaware, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	31	2	6.5%	16	1	6.3%	47	3	6.4%
2012	34	1	2.9%	16	2	12.5%	50	3	6.0%
2014	30	2	6.7%	17	0	0.0%	47	2	4.3%
2016	31	1	3.2%	19	0	0.0%	50	1	2.0%
2018	20	0	0.0%	16	2	12.5%	36	2	5.6%

Primary defeats

There were 51 seats up for election in Delaware. Overall, 37 incumbents filed for re-election, including 21 Democrats and 16 Republicans. Of that total, one Democratic incumbent lost in a primary, representing 2.7% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Delaware, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	19	3	1	5.3%	12	0	0	0.0%	31	3	1	3.2%
Senate	2	0	0	0.0%	4	0	0	0.0%	6	0	0	0.0%
Total	21	3	1	4.8%	16	0	0	0.0%	37	3	1	2.7%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Delaware, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	32	6	1	3.1%	16	1	0	0.0%	48	7	1	2.1%
2012	35	6	1	2.9%	18	5	2	11.1%	53	11	3	5.7%
2014	31	6	1	3.2%	18	3	1	5.6%	49	9	2	4.1%
2016	31	5	0	0.0%	19	1	0	0.0%	50	6	0	0.0%
2018	21	3	1	4.8%	16	0	0	0.0%	37	3	1	2.7%

Florida

General election defeats

There were 140 seats up for election in Florida. Overall, 99 incumbents advanced to the general election, including 37 Democrats and 62 Republicans. Of that total, six incumbents lost—two Democrats and four Republicans—representing 6.1% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Florida, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	32	2	6.3%	52	3	5.8%	84	5	6.0%
Senate	5	0	0.0%	10	1	10.0%	15	1	6.7%
Total	37	2	5.4%	62	4	6.5%	99	6	6.1%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Florida, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	40	5	12.5%	55	0	0.0%	95	5	5.3%
2012	29	0	0.0%	77	5	6.5%	106	5	4.7%
2014	42	5	11.9%	79	0	0.0%	121	5	4.1%
2016	25	2	8.0%	72	1	1.4%	97	3	3.1%
2018	37	2	5.4%	62	4	6.5%	99	6	6.1%

Primary defeats

There were 140 seats up for election in Florida. Overall, 102 incumbents filed for re-election, including 39 Democrats and 63 Republicans. Of that total, two Democratic incumbents lost in primaries, representing 2.0% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Florida, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	33	8	1	3.0%	52	6	0	0.0%	85	14	1	1.2%
Senate	6	3	1	16.7%	11	2	0	0.0%	17	5	1	5.9%
Total	39	11	2	5.1%	63	8	0	0.0%	102	19	2	2.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Florida, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	40	6	0	0.0%	57	12	1	1.8%	97	18	1	1.0%
2012	31	7	2	6.5%	79	24	1	1.3%	110	31	3	2.7%
2014	43	8	1	2.3%	79	13	0	0.0%	122	21	1	0.8%
2016	26	7	0	0.0%	72	7	0	0.0%	98	14	0	0.0%
2018	39	11	2	5.1%	63	8	0	0.0%	102	19	2	2.0%

Georgia

General election defeats

There were 236 seats up for election in Georgia. Overall, 207 incumbents advanced to the general election, including 78 Democrats and 129 Republicans. Of that total, ten incumbents lost—two Democrats and eight Republicans—representing 4.8% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Georgia, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	60	2	3.3%	95	7	7.4%	155	9	5.8%
Senate	18	0	0.0%	34	1	2.9%	52	1	1.9%
Total	78	2	2.6%	129	8	6.2%	207	10	4.8%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Georgia, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	84	2	2.4%	108	1	0.9%	193	3	1.6%
2012	67	3	4.5%	128	0	0.0%	196	3	1.5%
2014	72	0	0.0%	139	0	0.0%	212	0	0.0%
2016	68	1	1.5%	141	3	2.1%	209	4	1.9%
2018	78	2	2.6%	129	8	6.2%	207	10	4.8%

Primary defeats

There were 236 seats up for election in Georgia. Overall, 216 incumbents filed for re-election, including 82 Democrats and 134 Republicans. Of that total, nine incumbents lost in primaries—four Democrats and five Republicans—representing 4.2% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Georgia, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	63	21	3	4.8%	100	22	5	5.0%	163	43	8	4.9%
Senate	19	6	1	5.3%	34	4	0	0.0%	53	10	1	1.9%
Total	82	27	4	4.9%	134	26	5	3.7%	216	53	9	4.2%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Georgia, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	86	19	2	2.3%	111	22	3	2.7%	198	41	5	2.5%
2012	73	25	6	8.2%	136	23	6	4.4%	210	48	12	5.7%
2014	74	17	2	2.7%	144	30	5	3.5%	219	47	7	3.2%
2016	71	19	3	4.2%	143	30	2	1.4%	214	49	5	2.3%
2018	82	27	4	4.9%	134	26	5	3.7%	216	53	9	4.2%

Hawaii

General election defeats

There were 63 seats up for election in Hawaii. Overall, 51 incumbents advanced to the general election, including 47 Democrats and four Republicans. No incumbents who advanced to the general election lost.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Hawaii, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	38	0	0.0%	4	0	0.0%	42	0	0.0%
Senate	9	0	0.0%	0	0	0.0%	9	0	0.0%
Total	47	0	0.0%	4	0	0.0%	51	0	0.0%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Hawaii, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	51	1	2.0%	6	0	0.0%	57	1	1.8%
2012	60	1	1.7%	6	2	33.3%	66	3	4.5%
2014	49	0	0.0%	6	0	0.0%	55	0	0.0%
2016	52	0	0.0%	8	2	25.0%	60	2	3.3%
2018	47	0	0.0%	4	0	0.0%	51	0	0.0%

Primary defeats

There were 63 seats up for election in Hawaii. Overall, 54 incumbents filed for re-election, including 50 Democrats and four Republicans. Of that total, three Democratic incumbents lost in primaries, representing 5.6% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Hawaii, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	40	17	2	5.0%	4	0	0	0.0%	44	17	2	4.5%
Senate	10	6	1	10.0%	0	0	0	#DIV/0!	10	6	1	10.0%
Total	50	23	3	6.0%	4	0	0	0.0%	54	23	3	5.6%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Hawaii, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	52	24	1	1.9%	6	0	0	0.0%	58	24	1	1.7%
2012	64	24	4	6.3%	7	2	1	14.3%	71	26	5	7.0%
2014	52	19	3	5.8%	6	1	0	0.0%	58	20	3	5.2%
2016	53	22	1	1.9%	8	2	0	0.0%	61	24	1	1.6%
2018	50	23	3	6.0%	4	0	0	0.0%	54	23	3	5.6%

Idaho

General election defeats

There were 105 seats up for election in Idaho. Overall, 83 incumbents advanced to the general election, including 14 Democrats and 69 Republicans. Of that total, five Republican incumbents lost, representing 6.0% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Idaho, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	8	0	0.0%	45	4	8.9%	53	4	7.5%
Senate	6	0	0.0%	24	1	4.2%	30	1	3.3%
Total	14	0	0.0%	69	5	7.2%	83	5	6.0%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Idaho, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	19	2	10.5%	71	0	0.0%	90	2	2.2%
2012	11	0	0.0%	55	2	3.6%	66	2	3.0%
2014	15	0	0.0%	73	2	2.7%	88	2	2.3%
2016	17	2	11.8%	72	0	0.0%	89	2	2.2%
2018	14	0	0.0%	69	5	7.2%	83	5	6.0%

Primary defeats

There were 105 seats up for election in Idaho. Overall, 89 incumbents filed for re-election, including 14 Democrats and 75 Republicans. Of that total, six Republican incumbents lost in primaries, representing 6.7% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Idaho, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	8	1	0	0.0%	50	18	5	10.0%	58	19	5	8.6%
Senate	6	0	0	0.0%	25	12	1	4.0%	31	12	1	3.2%
Total	14	1	0	0.0%	75	30	6	8.0%	89	31	6	6.7%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Idaho, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	19	1	0	0.0%	77	25	6	7.8%	96	26	6	6.3%
2012	11	1	0	0.0%	59	33	3	5.1%	70	34	3	4.3%
2014	15	1	0	0.0%	79	29	6	7.6%	94	30	6	6.4%
2016	17	1	0	0.0%	79	30	7	8.9%	96	31	7	7.3%
2018	14	1	0	0.0%	75	30	6	8.0%	89	31	6	6.7%

Illinois

General election defeats

There were 157 seats up for election in Illinois. Overall, 130 incumbents advanced to the general election, including 75 Democrats and 55 Republicans. Of that total, ten incumbents lost—one Democrat and nine Republicans—representing 7.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Illinois, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	58	1	1.7%	40	6	15.0%	98	7	7.1%
Senate	17	0	0.0%	15	3	20.0%	32	3	9.4%
Total	75	1	1.3%	55	9	16.4%	130	10	7.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Illinois, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	75	7	9.3%	50	0	0.0%	125	7	5.6%
2012	81	0	0.0%	58	5	8.6%	139	5	3.6%
2014	80	1	1.3%	43	0	0.0%	123	1	0.8%
2016	90	5	5.6%	53	1	1.9%	143	6	4.2%
2018	75	1	1.3%	55	9	16.4%	130	10	7.7%

Primary defeats

There were 157 seats up for election in Illinois. Overall, 129 incumbents filed for re-election, including 77 Democrats and 52 Republicans. Of that total, three incumbents lost in primaries—two Democrats and one Republican—representing 2.3% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Illinois, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	59	8	1	1.7%	38	7	1	2.6%	97	15	2	2.1%
Senate	18	2	1	5.6%	14	0	0	0.0%	32	2	1	3.1%
Total	77	10	2	2.6%	52	7	1	1.9%	129	17	3	2.3%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Illinois, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	76	14	0	0.0%	51	7	1	2.0%	127	21	1	0.8%
2012	82	21	1	1.2%	63	12	5	7.9%	145	33	6	4.1%
2014	82	9	2	2.4%	43	5	1	2.3%	125	14	3	2.4%
2016	92	11	1	1.1%	52	6	0	0.0%	144	17	1	0.7%
2018	77	10	2	2.6%	52	7	1	1.9%	129	17	3	2.3%

Indiana

General election defeats

There were 125 seats up for election in Indiana. Overall, 109 incumbents advanced to the general election, including 28 Democrats and 81 Republicans. Of that total, four Republican incumbents lost, representing 3.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Indiana, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	25	0	0.0%	62	3	4.8%	87	3	3.4%
Senate	3	0	0.0%	19	1	5.3%	22	1	4.5%
Total	28	0	0.0%	81	4	4.9%	109	4	3.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Indiana, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	56	10	17.9%	55	0	0.0%	111	10	9.0%
2012	34	3	8.8%	68	2	2.9%	102	5	4.9%
2014	36	5	13.9%	79	1	1.3%	115	6	5.2%
2016	29	0	0.0%	76	1	1.3%	105	1	1.0%
2018	28	0	0.0%	81	4	4.9%	109	4	3.7%

Primary defeats

There were 125 seats up for election in Indiana. Overall, 111 incumbents filed for re-election, including 28 Democrats and 83 Republicans. Of that total, two Republican incumbents lost in primaries, representing 1.8% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Indiana, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	25	5	0	0.0%	63	12	1	1.6%	88	17	1	1.1%
Senate	3	2	0	0.0%	20	4	1	5.0%	23	6	1	4.3%
Total	28	7	0	0.0%	83	16	2	2.4%	111	23	2	1.8%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Indiana, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	56	6	0	0.0%	57	15	2	3.5%	113	21	2	1.8%
2012	35	5	0	0.0%	68	12	0	0.0%	103	17	0	0.0%
2014	36	0	0	0.0%	81	11	3	3.7%	117	11	3	2.6%
2016	30	2	0	0.0%	78	15	2	2.6%	108	17	2	1.9%
2018	28	7	0	0.0%	83	16	2	2.4%	111	23	2	1.8%

Iowa

General election defeats

There were 125 seats up for election in Iowa. Overall, 101 incumbents advanced to the general election, including 46 Democrats and 55 Republicans. Of that total, seven incumbents lost—two Democrats and five Republicans—representing 6.9% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Iowa, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	37	1	2.7%	46	4	8.7%	83	5	6.0%
Senate	9	1	11.1%	9	1	11.1%	18	2	11.1%
Total	46	2	4.3%	55	5	9.1%	101	7	6.9%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Iowa, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	63	18	28.6%	42	0	0.0%	105	18	17.1%
2012	45	1	2.2%	51	7	13.7%	96	8	8.3%
2014	55	5	9.1%	54	0	0.0%	109	5	4.6%
2016	49	7	14.3%	61	0	0.0%	110	7	6.4%
2018	46	2	4.3%	55	5	9.1%	101	7	6.9%

Primary defeats

There were 125 seats up for election in Iowa. Overall, 103 incumbents filed for re-election, including 48 Democrats and 55 Republicans. No incumbents who filed for re-election lost in primaries.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Iowa, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	37	1	0	0.0%	47	2	0	0.0%	84	3	0	0.0%
Senate	11	0	0	0.0%	8	2	0	0.0%	19	2	0	0.0%
Total	48	1	0	0.0%	55	4	0	0.0%	103	5	0	0.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Iowa, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	65	5	1	1.5%	43	3	1	2.3%	108	8	2	1.9%
2012	45	0	0	0.0%	55	16	3	5.5%	100	16	3	3.0%
2014	55	3	0	0.0%	55	5	0	0.0%	110	8	0	0.0%
2016	50	4	1	2.0%	62	5	0	0.0%	112	9	1	0.9%
2018	48	1	0	0.0%	55	4	0	0.0%	103	5	0	0.0%

Kansas

General election defeats

There were 125 seats up for election in Kansas. Overall, 105 incumbents advanced to the general election, including 40 Democrats and 65 Republicans. Of that total, eight incumbents lost—five Democrats and three Republicans—representing 7.6% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Kansas, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	40	5	12.5%	65	3	4.6%	105	8	7.6%
Senate	Did not hold elections.
Total	40	5	12.5%	65	3	4.6%	105	8	7.6%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Kansas, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	44	13	29.5%	66	0	0.0%	110	13	11.8%
2012	36	8	22.2%	71	6	8.5%	107	14	13.1%
2014	29	3	10.3%	80	0	0.0%	109	3	2.8%
2016	33	0	0.0%	84	11	13.1%	117	11	9.4%
2018	40	5	12.5%	65	3	4.6%	105	8	7.6%

Primary defeats

There were 125 seats up for election in Kansas. Overall, 112 incumbents filed for re-election, including 40 Democrats and 72 Republicans. Of that total, seven Republican incumbents lost in primaries, representing 6.3% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Kansas, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	40	7	0	0.0%	72	19	7	9.7%	112	26	7	6.3%
Senate	Did not hold elections.
Total	40	7	0	0.0%	72	19	7	9.7%	112	26	7	6.3%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Kansas, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	45	3	1	2.2%	70	20	4	5.7%	115	23	5	4.3%
2012	37	6	1	2.7%	90	48	19	21.1%	127	54	20	15.7%
2014	29	0	0	0.0%	83	21	3	3.6%	112	21	3	2.7%
2016	34	4	1	2.9%	98	35	14	14.3%	132	39	15	11.4%
2018	40	7	0	0.0%	72	19	7	9.7%	112	26	7	6.3%

Kentucky

General election defeats

There were 119 seats up for election in Kentucky. Overall, 94 incumbents advanced to the general election, including 28 Democrats and 66 Republicans. Of that total, nine incumbents lost—three Democrats and six Republicans—representing 9.6% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Kentucky, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	25	2	8.0%	51	6	11.8%	76	8	10.5%
Senate	3	1	33.3%	15	0	0.0%	18	1	5.6%
Total	28	3	10.7%	66	6	9.1%	94	9	9.6%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Kentucky, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	67	7	10.4%	42	1	2.4%	110	8	7.3%
2012	63	3	4.8%	41	1	2.4%	104	4	3.8%
2014	54	3	5.6%	52	1	1.9%	106	4	3.8%
2016	56	17	30.4%	51	1	2.0%	107	18	16.8%
2018	28	3	10.7%	66	6	9.1%	94	9	9.6%

Primary defeats

There were 119 seats up for election in Kentucky. Overall, 98 incumbents filed for re-election, including 29 Democrats and 69 Republicans. Of that total, four incumbents lost in primaries—one Democrat and three Republicans—representing 4.1% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Kentucky, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	26	3	1	3.8%	54	11	3	5.6%	80	14	4	5.0%
Senate	3	1	0	0.0%	15	4	0	0.0%	18	5	0	0.0%
Total	29	4	1	3.4%	69	15	3	4.3%	98	19	4	4.1%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Kentucky, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	68	11	1	1.5%	43	10	1	2.3%	112	21	2	1.8%
2012	64	11	1	1.6%	42	11	0	0.0%	106	22	1	0.9%
2014	55	6	1	1.8%	53	9	1	1.9%	108	15	2	1.9%
2016	57	7	1	1.8%	52	9	1	1.9%	109	16	2	1.8%
2018	29	4	1	3.4%	69	15	3	4.3%	98	19	4	4.1%

Maine

General election defeats

There were 186 seats up for election in Maine. Overall, 126 incumbents advanced to the general election, including 73 Democrats, 50 Republicans, and three independents. Of that total, 11 incumbents lost—one Democrat, nine Republicans, and one independent—representing 8.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Maine, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	58	1	1.7%	42	8	19.0%	103	10	9.7%
Senate	15	0	0.0%	8	1	12.5%	23	1	4.3%
Total	73	1	1.4%	50	9	18.0%	126	11	8.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Maine, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	90	19	21.1%	49	1	2.0%	139	20	14.4%
2012	53	1	1.9%	66	16	24.2%	121	17	14.0%
2014	81	11	13.6%	42	2	4.8%	127	13	10.2%
2016	69	8	11.6%	78	5	6.4%	147	13	8.8%
2018	73	1	1.4%	50	9	18.0%	126	11	8.7%

Primary defeats

There were 186 seats up for election in Maine. Overall, 130 incumbents filed for re-election, including 74 Democrats and 53 Republicans. No incumbents who filed for re-election lost in primaries.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Maine, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	59	2	0	0.0%	45	0	0	0.0%	107	2	0	0.0%
Senate	15	0	0	0.0%	8	0	0	0.0%	23	0	0	0.0%
Total	74	2	0	0.0%	53	0	0	0.0%	130	2	0	0.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Maine, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	94	3	1	1.1%	49	1	0	0.0%	143	4	1	0.7%
2012	54	4	0	0.0%	67	1	0	0.0%	123	5	0	0.0%
2014	85	2	0	0.0%	48	1	0	0.0%	137	3	0	0.0%
2016	69	2	0	0.0%	80	2	1	1.3%	149	4	1	0.7%
2018	74	2	0	0.0%	53	0	0	0.0%	130	2	0	0.0%

Maryland

General election defeats

There were 188 seats up for election in Maryland. Overall, 136 incumbents advanced to the general election, including 83 Democrats and 53 Republicans. Of that total, eight incumbents lost—one Democrat and seven Republicans—representing 5.9% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Maryland, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	63	0	0.0%	41	6	14.6%	104	6	5.8%
Senate	20	1	5.0%	12	1	8.3%	32	2	6.3%
Total	83	1	1.2%	53	7	13.2%	136	8	5.9%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Maryland, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	114	2	1.8%	37	1	2.7%	151	3	2.0%
2012	Did not hold elections.
2014	95	7	7.4%	31	0	0.0%	126	7	5.6%
2016	Did not hold elections.
2018	83	1	1.2%	53	7	13.2%	136	8	5.9%

Primary defeats

There were 188 seats up for election in Maryland. Overall, 149 incumbents filed for re-election, including 95 Democrats and 54 Republicans. Of that total, 13 incumbents lost in primaries—12 Democrats and one Republican—representing 8.7% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Maryland, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	71	67	8	11.3%	41	23	0	0.0%	112	90	8	7.1%
Senate	24	14	4	16.7%	13	3	1	7.7%	37	17	5	13.5%
Total	95	81	12	12.6%	54	26	1	1.9%	149	107	13	8.7%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Maryland, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	121	78	7	5.8%	41	27	4	9.8%	162	105	11	6.8%
2012	Did not hold elections.
2014	101	70	6	5.9%	37	24	6	16.2%	138	94	12	8.7%
2016	Did not hold elections.
2018	95	81	12	12.6%	54	26	1	1.9%	149	107	13	8.7%

Massachusetts

General election defeats

There were 200 seats up for election in Massachusetts. Overall, 173 incumbents advanced to the general election, including 134 Democrats, 37 Republicans, and two independents. Of that total, three incumbents lost—two Republicans and one independent—representing 1.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Massachusetts, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	105	0	0.0%	30	1	3.3%	137	2	1.5%
Senate	29	0	0.0%	7	1	14.3%	36	1	2.8%
Total	134	0	0.0%	37	2	5.4%	173	3	1.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Massachusetts, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	150	10	6.7%	15	0	0.0%	165	10	6.1%
2012	149	0	0.0%	35	2	5.7%	184	2	1.1%
2014	148	3	2.0%	30	0	0.0%	178	3	1.7%
2016	145	0	0.0%	40	0	0.0%	185	0	0.0%
2018	134	0	0.0%	37	2	5.4%	173	3	1.7%

Primary defeats

There were 200 seats up for election in Massachusetts. Overall, 176 incumbents filed for re-election, including 137 Democrats and 37 Republicans. Of that total, three Democratic incumbents lost in primaries, representing 1.7% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Massachusetts, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	108	16	3	2.8%	30	1	0	0.0%	140	17	3	2.1%
Senate	29	3	0	0.0%	7	0	0	0.0%	36	3	0	0.0%
Total	137	19	3	2.2%	37	1	0	0.0%	176	20	3	1.7%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Massachusetts, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	151	14	1	0.7%	15	0	0	0.0%	166	14	1	0.6%
2012	154	18	4	2.6%	36	1	0	0.0%	190	19	4	2.1%
2014	148	16	1	0.7%	30	1	0	0.0%	178	17	1	0.6%
2016	147	19	2	1.4%	40	1	0	0.0%	187	20	2	1.1%
2018	137	19	3	2.2%	37	1	0	0.0%	176	20	3	1.7%

Michigan

General election defeats

There were 148 seats up for election in Michigan. Overall, 75 incumbents advanced to the general election, including 30 Democrats and 45 Republicans. Of that total, three Republican incumbents lost, representing 4.0% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Michigan, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	28	0	0.0%	37	1	2.7%	65	1	1.5%
Senate	2	0	0.0%	8	2	25.0%	10	2	20.0%
Total	30	0	0.0%	45	3	6.7%	75	3	4.0%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Michigan, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	40	9	22.5%	28	0	0.0%	68	9	13.2%
2012	32	0	0.0%	55	5	9.1%	87	5	5.7%
2014	40	2	5.0%	56	0	0.0%	96	2	2.1%
2016	32	1	3.1%	36	0	0.0%	68	1	1.5%
2018	30	0	0.0%	45	3	6.7%	75	3	4.0%

Primary defeats

There were 148 seats up for election in Michigan. Overall, 78 incumbents filed for re-election, including 32 Democrats and 46 Republicans. Of that total, three incumbents lost in primaries—two Democrats and one Republican—representing 3.8% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Michigan, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	29	13	1	3.4%	38	7	1	2.6%	67	20	2	3.0%
Senate	3	1	1	33.3%	8	2	0	0.0%	11	3	1	9.1%
Total	32	14	2	6.3%	46	9	1	2.2%	78	23	3	3.8%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Michigan, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	40	10	0	0.0%	28	7	0	0.0%	68	17	0	0.0%
2012	36	19	4	11.1%	56	18	1	1.8%	92	37	5	5.4%
2014	40	9	0	0.0%	57	19	1	1.8%	97	28	1	1.0%
2016	32	14	0	0.0%	36	9	0	0.0%	68	23	0	0.0%
2018	32	14	2	6.3%	46	9	1	2.2%	78	23	3	3.8%

Minnesota

General election defeats

There were 134 seats up for election in Minnesota. Overall, 110 incumbents advanced to the general election, including 41 Democrats and 69 Republicans. Of that total, fifteen Republican incumbents lost, representing 13.6% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Minnesota, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	41	0	0.0%	69	15	21.7%	110	15	13.6%
Senate	Did not hold elections.
Total	41	0	0.0%	69	15	21.7%	110	15	13.6%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Minnesota, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	120	34	28.3%	55	0	0.0%	175	34	19.4%
2012	71	0	0.0%	81	16	19.8%	152	16	10.5%
2014	68	11	16.2%	51	0	0.0%	119	11	9.2%
2016	80	9	11.3%	89	2	2.2%	169	11	6.5%
2018	41	0	0.0%	69	15	21.7%	110	15	13.6%

Primary defeats

There were 134 seats up for election in Minnesota. Overall, 111 incumbents filed for re-election, including 41 Democrats and 70 Republicans. Of that total, one Republican incumbent lost in a primary, representing 0.9% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Minnesota, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	41	5	0	0.0%	70	2	1	1.4%	111	7	1	0.9%
Senate	Did not hold elections.
Total	41	5	0	0.0%	70	2	1	1.4%	111	7	1	0.9%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Minnesota, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	121	5	1	0.8%	56	3	1	1.8%	177	8	2	1.1%
2012	72	7	0	0.0%	82	4	1	1.2%	154	11	1	0.6%
2014	68	4	0	0.0%	51	1	0	0.0%	119	5	0	0.0%
2016	82	7	2	2.4%	91	4	2	2.2%	173	11	4	2.3%
2018	41	5	0	0.0%	70	2	1	1.4%	111	7	1	0.9%

Missouri

General election defeats

There were 180 seats up for election in Missouri. Overall, 115 incumbents advanced to the general election, including 33 Democrats and 82 Republicans. Of that total, three incumbents lost—one Democrat and two Republicans—representing 2.6% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Missouri, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	32	1	3.1%	75	2	2.7%	107	3	2.8%
Senate	1	0	0.0%	7	0	0.0%	8	0	0.0%
Total	33	1	3.0%	82	2	2.4%	115	3	2.6%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Missouri, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	53	12	22.6%	49	0	0.0%	102	12	11.8%
2012	36	2	5.6%	82	4	4.9%	118	6	5.1%
2014	48	5	10.4%	100	0	0.0%	148	5	3.4%
2016	32	0	0.0%	104	0	0.0%	137	1	0.7%
2018	33	1	3.0%	82	2	2.4%	115	3	2.6%

Primary defeats

There were 180 seats up for election in Missouri. Overall, 117 incumbents filed for re-election, including 34 Democrats and 83 Republicans. Of that total, one Democratic incumbent lost in a primary, representing 0.9% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Missouri, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	32	6	0	0.0%	76	11	0	0.0%	108	17	0	0.0%
Senate	2	1	1	50.0%	7	1	0	0.0%	9	2	1	11.1%
Total	34	7	1	2.9%	83	12	0	0.0%	117	19	1	0.9%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Missouri, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	55	8	2	3.6%	50	7	1	2.0%	105	15	3	2.9%
2012	43	19	7	16.3%	83	16	1	1.2%	126	35	8	6.3%
2014	47	8	0	0.0%	100	14	0	0.0%	147	22	0	0.0%
2016	35	7	2	5.7%	106	14	2	1.9%	142	21	4	2.8%
2018	34	7	1	2.9%	83	12	0	0.0%	117	19	1	0.9%

Montana

General election defeats

There were 125 seats up for election in Montana. Overall, 87 incumbents advanced to the general election, including 34 Democrats and 53 Republicans. Of that total, three Republican incumbents lost, representing 3.4% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Montana, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	28	0	0.0%	43	2	4.7%	71	2	2.8%
Senate	6	0	0.0%	10	1	10.0%	16	1	6.3%
Total	34	0	0.0%	53	3	5.7%	87	3	3.4%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Montana, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	33	9	27.3%	40	1	2.5%	73	10	13.7%
2012	26	1	3.8%	53	7	13.2%	79	8	10.1%
2014	30	2	6.7%	46	4	8.7%	76	6	7.9%
2016	35	2	5.7%	42	3	7.1%	77	5	6.5%
2018	34	0	0.0%	53	3	5.7%	87	3	3.4%

Primary defeats

There were 125 seats up for election in Montana. Overall, 89 incumbents filed for re-election, including 34 Democrats and 55 Republicans. Of that total, one Republican incumbent lost in a primary, representing 1.1% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Montana, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	28	1	0	0.0%	44	6	0	0.0%	72	7	0	0.0%
Senate	6	0	0	0.0%	11	3	1	9.1%	17	3	1	5.9%
Total	34	1	0	0.0%	55	9	1	1.8%	89	10	1	1.1%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Montana, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	34	3	1	2.9%	41	8	1	2.4%	75	11	2	2.7%
2012	26	3	1	3.8%	56	14	3	5.4%	82	17	4	4.9%
2014	32	3	0	0.0%	48	15	2	4.2%	80	18	2	2.5%
2016	36	1	0	0.0%	44	13	2	4.5%	80	14	2	2.5%
2018	34	1	0	0.0%	55	9	1	1.8%	89	10	1	1.1%

Nebraska

General election defeats

There were 24 seats up for election in Nebraska. Overall, 16 incumbents advanced to the general election, including three Democrats, 12 Republicans, and one independent. Of that total, three incumbents lost—two Republicans and one independent—representing 18.8% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Nebraska, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	N/A
Senate	3	0	0.0%	12	2	16.7%	16	3	18.8%
Total	3	0	0.0%	12	2	16.7%	16	3	18.8%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Nebraska, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	10	1	10.0%	10	0	0.0%	21	2	9.5%
2012	6	1	16.7%	10	0	0.0%	16	1	6.3%
2014	2	0	0.0%	5	0	0.0%	7	0	0.0%
2016	4	0	0.0%	8	5	62.5%	13	5	38.5%
2018	3	0	0.0%	12	2	16.7%	16	3	18.8%

Primary defeats

There were 24 seats up for election in Nebraska. Overall, 16 incumbents filed for re-election, including three Democrats and 12 Republicans. No incumbents who filed for re-election lost in primaries.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Nebraska, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	N/A
Senate	3	0	0	0.0%	12	4	0	0.0%	16	5	0	0.0%
Total	3	0	0	0.0%	12	4	0	0.0%	16	5	0	0.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Nebraska, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	10	4	0	0.0%	10	1	0	0.0%	21	6	0	0.0%
2012	6	2	0	0.0%	10	2	0	0.0%	16	4	0	0.0%
2014	2	0	0	0.0%	5	1	0	0.0%	7	1	0	0.0%
2016	4	2	0	0.0%	9	1	1	11.1%	14	4	1	7.1%
2018	3	0	0	0.0%	12	4	0	0.0%	16	5	0	0.0%

Nevada

General election defeats

There were 53 seats up for election in Nevada. Overall, 37 incumbents advanced to the general election, including 24 Democrats and 13 Republicans. Of that total, two Republican incumbents lost, representing 5.4% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Nevada, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	21	0	0.0%	10	2	20.0%	31	2	6.5%
Senate	3	0	0.0%	3	0	0.0%	6	0	0.0%
Total	24	0	0.0%	13	2	15.4%	37	2	5.4%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Nevada, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	17	2	11.8%	8	0	0.0%	25	2	8.0%
2012	23	1	4.3%	11	0	0.0%	34	1	2.9%
2014	26	7	26.9%	17	0	0.0%	43	7	16.3%
2016	21	0	0.0%	17	6	35.3%	39	7	17.9%
2018	24	0	0.0%	13	2	15.4%	37	2	5.4%

Primary defeats

There were 53 seats up for election in Nevada. Overall, 38 incumbents filed for re-election, including 24 Democrats and 14 Republicans. Of that total, one Republican incumbent lost in a primary, representing 2.6% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Nevada, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	21	2	0	0.0%	11	4	1	9.1%	32	6	1	3.1%
Senate	3	1	0	0.0%	3	1	0	0.0%	6	2	0	0.0%
Total	24	3	0	0.0%	14	5	1	7.1%	38	8	1	2.6%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Nevada, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	17	1	0	0.0%	9	4	1	11.1%	26	5	1	3.8%
2012	24	10	1	4.2%	12	2	1	8.3%	36	12	2	5.6%
2014	26	5	0	0.0%	17	8	0	0.0%	43	13	0	0.0%
2016	21	6	0	0.0%	19	11	2	10.5%	41	17	2	4.9%
2018	24	3	0	0.0%	14	5	1	7.1%	38	8	1	2.6%

New Hampshire

General election defeats

There were 424 seats up for election in New Hampshire. Overall, 303 incumbents advanced to the general election, including 141 Democrats, 159 Republicans, and three independents. Of that total, 52 incumbents lost—six Democrats, 43 Republicans, and three independents—representing 17.2% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in New Hampshire, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	132	5	3.8%	146	39	26.7%	281	47	16.7%
Senate	9	1	11.1%	13	4	30.8%	22	5	22.7%
Total	141	6	4.3%	159	43	27.0%	303	52	17.2%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in New Hampshire, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	174	88	50.6%	137	0	0.0%	311	88	28.3%
2012	82	4	4.9%	211	74	35.1%	293	78	26.6%
2014	169	43	25.4%	135	3	2.2%	304	46	15.1%
2016	128	11	8.6%	169	12	7.1%	297	23	7.7%
2018	141	6	4.3%	159	43	27.0%	303	52	17.2%

Primary defeats

There were 424 seats up for election in New Hampshire. Overall, 320 incumbents filed for re-election, including 147 Democrats and 170 Republicans. Of that total, 17 incumbents lost in primaries—six Democrats and 11 Republicans—representing 5.3% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in New Hampshire, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	138	30	6	4.3%	157	55	11	7.0%	298	85	17	5.7%
Senate	9	0	0	0.0%	13	2	0	0.0%	22	2	0	0.0%
Total	147	30	6	4.1%	170	57	11	6.5%	320	87	17	5.3%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in New Hampshire, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	178	45	3	1.7%	144	79	8	5.6%	322	124	11	3.4%
2012	85	14	3	3.5%	230	131	19	8.3%	315	145	22	7.0%
2014	170	24	1	0.6%	143	80	8	5.6%	313	104	9	2.9%
2016	128	25	0	0.0%	179	100	10	5.6%	307	125	10	3.3%
2018	147	30	6	4.1%	170	57	11	6.5%	320	87	17	5.3%

New Mexico

General election defeats

There were 70 seats up for election in New Mexico. Overall, 58 incumbents advanced to the general election, including 32 Democrats and 26 Republicans. Of that total, seven incumbents lost—one Democrat and six Republicans—representing 12.1% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in New Mexico, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	32	1	3.1%	26	6	23.1%	58	7	12.1%
Senate	Did not hold elections.
Total	32	1	3.1%	26	6	23.1%	58	7	12.1%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in New Mexico, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	43	7	16.3%	22	0	0.0%	65	7	10.8%
2012	45	4	8.9%	39	3	7.7%	85	8	9.4%
2014	31	5	16.1%	27	1	3.7%	58	6	10.3%
2016	52	1	1.9%	51	7	13.7%	103	8	7.8%
2018	32	1	3.1%	26	6	23.1%	58	7	12.1%

Primary defeats

There were 70 seats up for election in New Mexico. Overall, 61 incumbents filed for re-election, including 35 Democrats and 26 Republicans. Of that total, three Democratic incumbents lost in primaries, representing 4.9% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in New Mexico, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	35	5	3	8.6%	26	1	0	0.0%	61	6	3	4.9%
Senate	Did not hold elections.
Total	35	5	3	8.6%	26	1	0	0.0%	61	6	3	4.9%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in New Mexico, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	44	10	1	2.3%	23	4	1	4.3%	67	14	2	3.0%
2012	50	19	4	8.0%	40	5	1	2.5%	91	24	5	5.5%
2014	31	5	1	3.2%	28	2	1	3.6%	59	7	2	3.4%
2016	52	9	1	1.9%	50	0	0	0.0%	102	9	1	1.0%
2018	35	5	3	8.6%	26	1	0	0.0%	61	6	3	4.9%

New York

General election defeats

There were 213 seats up for election in New York. Overall, 185 incumbents advanced to the general election, including 121 Democrats, 63 Republicans, and one independent. Of that total, 11 incumbents lost—three Democrats and eight Republicans—representing 5.9% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in New York, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	96	3	3.1%	37	3	8.1%	134	6	4.5%
Senate	25	0	0.0%	26	5	19.2%	51	5	9.8%
Total	121	3	2.5%	63	8	12.7%	185	11	5.9%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in New York, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	124	10	8.1%	59	1	1.7%	183	11	6.0%
2012	116	0	0.0%	71	4	5.6%	187	4	2.1%
2014	125	4	3.2%	65	0	0.0%	190	4	2.1%
2016	126	1	0.8%	64	1	1.6%	190	2	1.1%
2018	121	3	2.5%	63	8	12.7%	185	11	5.9%

Primary defeats

There were 213 seats up for election in New York. Overall, 195 incumbents filed for re-election, including 131 Democrats and 64 Republicans. Of that total, 10 incumbents lost in primaries—nine Democrats and one Republican—representing 5.1% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in New York, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	99	15	2	2.0%	38	4	1	2.6%	137	19	3	2.2%
Senate	32	12	7	21.9%	26	0	0	0.0%	58	12	7	12.1%
Total	131	27	9	6.9%	64	4	1	1.6%	195	31	10	5.1%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in New York, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	128	35	4	3.1%	59	2	0	0.0%	187	37	4	2.1%
2012	118	24	2	1.7%	71	9	0	0.0%	189	33	2	1.1%
2014	126	22	1	0.8%	66	5	1	1.5%	192	27	2	1.0%
2016	129	28	3	2.3%	65	5	0	0.0%	194	33	3	1.5%
2018	131	27	9	6.9%	64	4	1	1.6%	195	31	10	5.1%

North Carolina

General election defeats

There were 170 seats up for election in North Carolina. Overall, 146 incumbents advanced to the general election, including 54 Democrats and 92 Republicans. Of that total, 16 incumbents lost—two Democrats and 14 Republicans—representing 11.0% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in North Carolina, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	40	2	5.0%	65	9	13.8%	105	11	10.5%
Senate	14	0	0.0%	27	5	18.5%	41	5	12.2%
Total	54	2	3.7%	92	14	15.2%	146	16	11.0%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in North Carolina, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	83	20	24.1%	63	0	0.0%	146	20	13.7%
2012	47	5	10.6%	70	1	1.4%	117	6	5.1%
2014	52	1	1.9%	102	4	3.9%	154	5	3.2%
2016	57	3	5.3%	95	3	3.2%	152	6	3.9%
2018	54	2	3.7%	92	14	15.2%	146	16	11.0%

Primary defeats

There were 170 seats up for election in North Carolina. Overall, 153 incumbents filed for re-election, including 57 Democrats and 96 Republicans. Of that total, eight incumbents lost in primaries—three Democrats and five Republicans—representing 5.2% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in North Carolina, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	42	8	2	4.8%	66	19	2	3.0%	108	27	4	3.7%
Senate	15	3	1	6.7%	30	9	3	10.0%	45	12	4	8.9%
Total	57	11	3	5.3%	96	28	5	5.2%	153	39	8	5.2%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in North Carolina, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	88	24	4	4.5%	64	15	1	1.6%	152	39	5	3.3%
2012	50	15	2	4.0%	77	22	5	6.5%	127	37	7	5.5%
2014	54	9	2	3.7%	102	20	2	2.0%	156	29	4	2.6%
2016	57	13	1	1.8%	93	18	1	1.1%	150	31	2	1.3%
2018	57	11	3	5.3%	96	28	5	5.2%	153	39	8	5.2%

North Dakota

General election defeats

There were 72 seats up for election in North Dakota. Overall, 59 incumbents advanced to the general election, including 11 Democrats and 48 Republicans. Of that total, four Republican incumbents lost, representing 6.8% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in North Dakota, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	7	0	0.0%	33	3	9.1%	40	3	7.5%
Senate	4	0	0.0%	15	1	6.7%	19	1	5.3%
Total	11	0	0.0%	48	4	8.3%	59	4	6.8%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in North Dakota, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	24	12	50.0%	33	0	0.0%	57	12	21.1%
2012	18	4	22.2%	39	2	5.1%	57	6	10.5%
2014	10	1	10.0%	49	2	4.1%	59	3	5.1%
2016	21	15	71.4%	31	2	6.5%	52	17	32.7%
2018	11	0	0.0%	48	4	8.3%	59	4	6.8%

Primary defeats

There were 72 seats up for election in North Dakota. Overall, 60 incumbents filed for re-election, including 11 Democrats and 49 Republicans. Of that total, one Republican incumbent lost in a primary, representing 1.7% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in North Dakota, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	7	0	0	0.0%	34	6	1	2.9%	41	6	1	2.4%
Senate	4	0	0	0.0%	15	0	0	0.0%	19	0	0	0.0%
Total	11	0	0	0.0%	49	6	1	2.0%	60	6	1	1.7%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in North Dakota, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	24	2	0	0.0%	33	0	0	0.0%	57	2	0	0.0%
2012	18	0	0	0.0%	43	10	4	9.3%	61	10	4	6.6%
2014	10	0	0	0.0%	49	4	0	0.0%	59	4	0	0.0%
2016	21	0	0	0.0%	33	7	2	6.1%	54	7	2	3.7%
2018	11	0	0	0.0%	49	6	1	2.0%	60	6	1	1.7%

Ohio

General election defeats

There were 116 seats up for election in Ohio. Overall, 74 incumbents advanced to the general election, including 24 Democrats and 50 Republicans. Of that total, one Republican incumbent lost, representing 1.4% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Ohio, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	21	0	0.0%	46	1	2.2%	67	1	1.5%
Senate	3	0	0.0%	4	0	0.0%	7	0	0.0%
Total	24	0	0.0%	50	1	2.0%	74	1	1.4%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Ohio, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	46	13	28.3%	40	0	0.0%	86	13	15.1%
2012	35	0	0.0%	65	2	3.1%	100	2	2.0%
2014	30	3	10.0%	56	0	0.0%	86	3	3.5%
2016	28	1	3.6%	59	0	0.0%	87	1	1.1%
2018	24	0	0.0%	50	1	2.0%	74	1	1.4%

Primary defeats

There were 116 seats up for election in Ohio. Overall, 74 incumbents filed for re-election, including 25 Democrats and 49 Republicans. Of that total, one Republican incumbent lost in a primary, representing 1.4% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Ohio, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	22	3	0	0.0%	45	12	1	2.2%	67	15	1	1.5%
Senate	3	3	0	0.0%	4	2	0	0.0%	7	5	0	0.0%
Total	25	6	0	0.0%	49	14	1	2.0%	74	20	1	1.4%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Ohio, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	47	6	1	2.1%	40	8	0	0.0%	87	14	1	1.1%
2012	36	6	0	0.0%	62	8	1	1.6%	98	14	1	1.0%
2014	31	4	1	3.2%	59	19	2	3.4%	90	23	3	3.3%
2016	28	4	0	0.0%	58	10	1	1.7%	86	14	1	1.2%
2018	25	6	0	0.0%	49	14	1	2.0%	74	20	1	1.4%

Oklahoma

General election defeats

There were 125 seats up for election in Oklahoma. Overall, 70 incumbents advanced to the general election, including 22 Democrats and 48 Republicans. Of that total, three Democratic incumbents lost, representing 4.3% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Oklahoma, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	19	3	15.8%	39	0	0.0%	58	3	5.2%
Senate	3	0	0.0%	9	0	0.0%	12	0	0.0%
Total	22	3	13.6%	48	0	0.0%	70	3	4.3%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Oklahoma, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	40	6	15.0%	62	0	0.0%	102	6	5.9%
2012	30	0	0.0%	71	0	0.0%	101	0	0.0%
2014	25	0	0.0%	70	1	1.4%	95	1	1.1%
2016	20	0	0.0%	61	0	0.0%	81	0	0.0%
2018	22	3	13.6%	48	0	0.0%	70	3	4.3%

Primary defeats

There were 125 seats up for election in Oklahoma. Overall, 82 incumbents filed for re-election, including 22 Democrats and 60 Republicans. Of that total, 12 Republican incumbents lost in primaries, representing 14.6% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Oklahoma, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	19	2	0	0.0%	50	29	11	22.0%	69	31	11	15.9%
Senate	3	0	0	0.0%	10	6	1	10.0%	13	6	1	7.7%
Total	22	2	0	0.0%	60	35	12	20.0%	82	37	12	14.6%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Oklahoma, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	41	5	1	2.4%	62	7	0	0.0%	103	12	1	1.0%
2012	30	2	0	0.0%	72	17	1	1.4%	102	19	1	1.0%
2014	25	1	0	0.0%	70	12	0	0.0%	95	13	0	0.0%
2016	20	4	0	0.0%	64	24	3	4.7%	84	28	3	3.6%
2018	22	2	0	0.0%	60	35	12	20.0%	82	37	12	14.6%

Oregon

General election defeats

There were 73 seats up for election in Oregon. Overall, 64 incumbents advanced to the general election, including 41 Democrats and 23 Republicans. Of that total, three Republican incumbents lost, representing 4.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Oregon, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	32	0	0.0%	19	3	15.8%	51	3	5.9%
Senate	9	0	0.0%	4	0	0.0%	13	0	0.0%
Total	41	0	0.0%	23	3	13.0%	64	3	4.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Oregon, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	43	4	9.3%	25	0	0.0%	68	4	5.9%
2012	30	0	0.0%	34	4	11.8%	64	4	6.3%
2014	38	0	0.0%	21	2	9.5%	59	2	3.4%
2016	30	0	0.0%	28	0	0.0%	58	0	0.0%
2018	41	0	0.0%	23	3	13.0%	64	3	4.7%

Primary defeats

There were 73 seats up for election in Oregon. Overall, 65 incumbents filed for re-election, including 42 Democrats and 23 Republicans. Of that total, two incumbents lost in primaries—one Democrat and one Republican—representing 3.1% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Oregon, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	32	2	0	0.0%	19	5	1	5.3%	51	7	1	2.0%
Senate	10	2	1	10.0%	4	0	0	0.0%	14	2	1	7.1%
Total	42	4	1	2.4%	23	5	1	4.3%	65	9	2	3.1%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Oregon, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	44	2	0	0.0%	25	7	0	0.0%	69	9	0	0.0%
2012	31	1	1	3.2%	35	3	1	2.9%	66	4	2	3.0%
2014	38	3	0	0.0%	22	3	1	4.5%	60	6	1	1.7%
2016	30	2	0	0.0%	28	2	0	0.0%	58	4	0	0.0%
2018	42	4	1	2.4%	23	5	1	4.3%	65	9	2	3.1%

Pennsylvania

General election defeats

There were 228 seats up for election in Pennsylvania. Overall, 189 incumbents advanced to the general election, including 78 Democrats and 111 Republicans. Of that total, 12 incumbents lost—two Democrats and 10 Republicans—representing 6.3% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Pennsylvania, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	71	2	2.8%	98	8	8.2%	169	10	5.9%
Senate	7	0	0.0%	13	2	15.4%	20	2	10.0%
Total	78	2	2.6%	111	10	9.0%	189	12	6.3%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Pennsylvania, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	101	9	8.9%	106	0	0.0%	207	9	4.3%
2012	83	0	0.0%	113	1	0.9%	196	1	0.5%
2014	90	4	4.4%	108	0	0.0%	198	4	2.0%
2016	83	4	4.8%	122	2	1.6%	205	6	2.9%
2018	78	2	2.6%	111	10	9.0%	189	12	6.3%

Primary defeats

There were 228 seats up for election in Pennsylvania. Overall, 196 incumbents filed for re-election, including 82 Democrats and 114 Republicans. Of that total, four incumbents lost in primaries—three Democrats and one Republican—representing 2.0% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Pennsylvania, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	75	14	3	4.0%	100	7	0	0.0%	175	21	3	1.7%
Senate	7	0	0	0.0%	14	1	1	7.1%	21	1	1	4.8%
Total	82	14	3	3.7%	114	8	1	0.9%	196	22	4	2.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Pennsylvania, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	100	20	0	0.0%	107	9	1	0.9%	207	29	1	0.5%
2012	88	17	4	4.5%	115	15	1	0.9%	203	32	5	2.5%
2014	95	30	5	5.3%	108	12	1	0.9%	203	42	6	3.0%
2016	89	19	4	4.5%	120	9	0	0.0%	209	28	4	1.9%
2018	82	14	3	3.7%	114	8	1	0.9%	196	22	4	2.0%

Rhode Island

General election defeats

There were 113 seats up for election in Rhode Island. Overall, 95 incumbents advanced to the general election, including 83 Democrats and 12 Republicans. Of that total, four incumbents lost—one Democrat and three Republicans—representing 4.2% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Rhode Island, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	55	1	1.8%	9	3	33.3%	64	4	6.3%
Senate	28	0	0.0%	3	0	0.0%	31	0	0.0%
Total	83	1	1.2%	12	3	25.0%	95	4	4.2%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Rhode Island, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	79	4	5.1%	8	0	0.0%	88	4	4.5%
2012	78	0	0.0%	15	4	26.7%	94	4	4.3%
2014	92	7	7.6%	9	0	0.0%	102	7	6.9%
2016	85	1	1.2%	13	1	7.7%	99	2	2.0%
2018	83	1	1.2%	12	3	25.0%	95	4	4.2%

Primary defeats

There were 113 seats up for election in Rhode Island. Overall, 98 incumbents filed for re-election, including 86 Democrats and 12 Republicans. Of that total, three Democratic incumbents lost in primaries, representing 3.1% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Rhode Island, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	56	12	1	1.8%	9	0	0	0.0%	65	12	1	1.5%
Senate	30	8	2	6.7%	3	0	0	0.0%	33	8	2	6.1%
Total	86	20	3	3.5%	12	0	0	0.0%	98	20	3	3.1%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Rhode Island, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	88	32	9	10.2%	9	2	1	11.1%	98	34	10	10.2%
2012	84	24	6	7.1%	15	2	0	0.0%	100	26	6	6.0%
2014	95	18	3	3.2%	9	0	0	0.0%	105	18	3	2.9%
2016	91	18	6	6.6%	13	0	0	0.0%	105	18	6	5.7%
2018	86	20	3	3.5%	12	0	0	0.0%	98	20	3	3.1%

South Carolina

General election defeats

There were 124 seats up for election in South Carolina. Overall, 111 incumbents advanced to the general election, including 39 Democrats and 72 Republicans. Of that total, three incumbents lost—one Democrat and two Republicans—representing 2.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in South Carolina, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	39	1	2.6%	72	2	2.8%	111	3	2.7%
Senate	Did not hold elections.
Total	39	1	2.6%	72	2	2.8%	111	3	2.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in South Carolina, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	48	3	6.3%	58	0	0.0%	106	3	2.8%
2012	55	0	0.0%	89	2	2.2%	144	2	1.4%
2014	41	0	0.0%	71	1	1.4%	112	1	0.9%
2016	56	0	0.0%	88	0	0.0%	144	0	0.0%
2018	39	1	2.6%	72	2	2.8%	111	3	2.7%

Primary defeats

There were 124 seats up for election in South Carolina. Overall, 116 incumbents filed for re-election, including 42 Democrats and 74 Republicans. Of that total, five incumbents lost in primaries—three Democrats and two Republicans—representing 4.3% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in South Carolina, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	42	11	3	7.1%	74	25	2	2.7%	116	36	5	4.3%
Senate	Did not hold elections.
Total	42	11	3	7.1%	74	25	2	2.7%	116	36	5	4.3%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in South Carolina, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	48	11	0	0.0%	64	15	5	7.8%	112	26	5	4.5%
2012	57	7	2	3.5%	91	16	3	3.3%	148	23	5	3.4%
2014	42	5	0	0.0%	73	15	2	2.7%	115	20	2	1.7%
2016	57	14	1	1.8%	96	28	8	8.3%	153	42	9	5.9%
2018	42	11	3	7.1%	74	25	2	2.7%	116	36	5	4.3%

South Dakota

General election defeats

There were 105 seats up for election in South Dakota. Overall, 76 incumbents advanced to the general election, including nine Democrats and 67 Republicans. Of that total, four incumbents lost—one Democrats and three Republicans—representing 5.3% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in South Dakota, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	6	1	16.7%	43	3	7.0%	49	4	8.2%
Senate	3	0	0.0%	24	0	0.0%	27	0	0.0%
Total	9	1	11.1%	67	3	4.5%	76	4	5.3%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in South Dakota, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	25	9	36.0%	44	0	0.0%	69	9	13.0%
2012	13	0	0.0%	53	4	7.5%	66	4	6.1%
2014	16	2	12.5%	58	1	1.7%	74	3	4.1%
2016	10	1	10.0%	50	1	2.0%	60	2	3.3%
2018	9	1	11.1%	67	3	4.5%	76	4	5.3%

Primary defeats

There were 105 seats up for election in South Dakota. Overall, 79 incumbents filed for re-election, including nine Democrats and 70 Republicans. No incumbents who filed for re-election lost in primaries.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in South Dakota, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	6	3	0	0.0%	46	12	0	0.0%	52	15	0	0.0%
Senate	3	0	0	0.0%	24	5	0	0.0%	27	5	0	0.0%
Total	9	3	0	0.0%	70	17	0	0.0%	79	20	0	0.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in South Dakota, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	26	3	1	3.8%	45	4	0	0.0%	71	7	1	1.4%
2012	15	3	1	6.7%	59	22	4	6.8%	74	25	5	6.8%
2014	16	2	0	0.0%	58	15	0	0.0%	74	17	0	0.0%
2016	10	0	0	0.0%	53	18	2	3.8%	63	18	2	3.2%
2018	9	3	0	0.0%	70	17	0	0.0%	79	20	0	0.0%

Tennessee

General election defeats

There were 116 seats up for election in Tennessee. Overall, 85 incumbents advanced to the general election, including 19 Democrats and 66 Republicans. Of that total, one Republican incumbent lost, representing 1.2% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Tennessee, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	18	0	0.0%	54	1	1.9%	72	1	1.4%
Senate	1	0	0.0%	12	0	0.0%	13	0	0.0%
Total	19	0	0.0%	66	1	1.5%	85	1	1.2%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Tennessee, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	54	13	24.1%	49	0	0.0%	104	13	12.5%
2012	25	1	4.0%	60	1	1.7%	86	2	2.3%
2014	27	2	7.4%	69	0	0.0%	96	2	2.1%
2016	25	1	4.0%	81	1	1.2%	106	2	1.9%
2018	19	0	0.0%	66	1	1.5%	85	1	1.2%

Primary defeats

There were 116 seats up for election in Tennessee. Overall, 89 incumbents filed for re-election, including 20 Democrats and 69 Republicans. Of that total, three incumbents lost in primaries—one Democrat and two Republicans—representing 3.4% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Tennessee, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	18	6	0	0.0%	57	16	2	3.5%	75	22	2	2.7%
Senate	2	1	1	50.0%	12	1	0	0.0%	14	2	1	7.1%
Total	20	7	1	5.0%	69	17	2	2.9%	89	24	3	3.4%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Tennessee, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	54	6	0	0.0%	51	6	2	3.9%	106	12	2	1.9%
2012	30	11	5	16.7%	67	24	7	10.4%	98	35	12	12.2%
2014	29	5	2	6.9%	75	20	6	8.0%	104	25	8	7.7%
2016	26	8	0	0.0%	83	26	2	2.4%	109	34	2	1.8%
2018	20	7	1	5.0%	69	17	2	2.9%	89	24	3	3.4%

Texas

General election defeats

There were 165 seats up for election in Texas. Overall, 142 incumbents advanced to the general election, including 52 Democrats and 90 Republicans. Of that total, 10 Republican incumbents lost, representing 7.0% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Texas, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	49	0	0.0%	80	8	10.0%	129	8	6.2%
Senate	3	0	0.0%	10	2	20.0%	13	2	15.4%
Total	52	0	0.0%	90	10	11.1%	142	10	7.0%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Texas, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	71	21	29.6%	80	0	0.0%	151	21	13.9%
2012	52	0	0.0%	83	3	3.6%	135	3	2.2%
2014	55	2	3.6%	83	0	0.0%	138	2	1.4%
2016	53	0	0.0%	90	4	4.4%	144	5	3.5%
2018	52	0	0.0%	90	10	11.1%	142	10	7.0%

Primary defeats

There were 165 seats up for election in Texas. Overall, 151 incumbents filed for re-election, including 57 Democrats and 94 Republicans. Of that total, nine incumbents lost in primaries—five Democrats and four Republicans—representing 6.0% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Texas, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	54	16	5	9.3%	83	27	3	3.6%	137	43	8	5.8%
Senate	3	1	0	0.0%	11	6	1	9.1%	14	7	1	7.1%
Total	57	17	5	8.8%	94	33	4	4.3%	151	50	9	6.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Texas, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	75	8	4	5.3%	82	20	3	3.7%	157	28	7	4.5%
2012	53	8	0	0.0%	94	43	11	11.7%	147	51	11	7.5%
2014	57	11	2	3.5%	93	28	9	9.7%	150	39	11	7.3%
2016	54	13	0	0.0%	95	33	5	5.3%	150	46	5	3.3%
2018	57	17	5	8.8%	94	33	4	4.3%	151	50	9	6.0%

Utah

General election defeats

There were 89 seats up for election in Utah. Overall, 67 incumbents advanced to the general election, including 14 Democrats and 53 Republicans. Of that total, one Republican incumbent lost, representing 1.5% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Utah, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	11	0	0.0%	48	1	2.1%	59	1	1.7%
Senate	3	0	0.0%	5	0	0.0%	8	0	0.0%
Total	14	0	0.0%	53	1	1.9%	67	1	1.5%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Utah, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	27	6	22.2%	52	0	0.0%	79	6	7.6%
2012	15	1	6.7%	55	1	1.8%	70	2	2.9%
2014	13	1	7.7%	61	0	0.0%	74	1	1.4%
2016	13	1	7.7%	63	1	1.6%	76	2	2.6%
2018	14	0	0.0%	53	1	1.9%	67	1	1.5%

Primary defeats

There were 89 seats up for election in Utah. Overall, 65 incumbents filed for re-election, including 14 Democrats and 51 Republicans. No incumbents who filed for re-election lost in primaries.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Utah, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	11	0	0	0.0%	46	3	0	0.0%	57	3	0	0.0%
Senate	3	0	0	0.0%	5	0	0	0.0%	8	0	0	0.0%
Total	14	0	0	0.0%	51	3	0	0.0%	65	3	0	0.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Utah, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	27	1	0	0.0%	54	8	2	3.7%	81	9	2	2.5%
2012	17	2	2	11.8%	61	12	6	9.8%	78	14	8	10.3%
2014	13	0	0	0.0%	64	4	3	4.7%	77	4	3	3.9%
2016	13	0	0	0.0%	63	6	3	4.8%	76	6	3	3.9%
2018	14	0	0	0.0%	51	3	0	0.0%	65	3	0	0.0%

Vermont

General election defeats

There were 180 seats up for election in Vermont. Overall, 145 incumbents advanced to the general election, including 91 Democrats, 44 Republicans, and 10 independents. Of that total, 10 incumbents lost—one Democrat, six Republicans, and three independents—representing 6.9% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Vermont, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	70	1	1.4%	40	6	15.0%	120	10	8.3%
Senate	21	0	0.0%	4	0	0.0%	25	0	0.0%
Total	91	1	1.1%	44	6	13.6%	145	10	6.9%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Vermont, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	106	4	3.8%	47	2	4.3%	158	6	3.8%
2012	106	3	2.8%	45	3	6.7%	155	6	3.9%
2014	105	11	10.5%	44	0	0.0%	152	11	7.2%
2016	88	6	6.8%	57	4	7.0%	151	10	6.6%
2018	91	1	1.1%	44	6	13.6%	145	10	6.9%

Primary defeats

There were 180 seats up for election in Vermont. Overall, 148 incumbents filed for re-election, including 88 Democrats and 44 Republicans. Of that total, three incumbents lost in primaries—two Democrats and one Republican—representing 2.0% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Vermont, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	69	5	2	2.9%	39	2	0	0.0%	122	7	2	1.6%
Senate	19	10	0	0.0%	5	2	1	20.0%	26	12	1	3.8%
Total	88	15	2	2.3%	44	4	1	2.3%	148	19	3	2.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Vermont, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	107	8	0	0.0%	47	5	0	0.0%	159	13	0	0.0%
2012	105	11	0	0.0%	45	1	0	0.0%	155	12	0	0.0%
2014	105	5	0	0.0%	45	3	1	2.2%	153	8	1	0.7%
2016	88	23	0	0.0%	58	4	1	1.7%	152	27	1	0.7%
2018	88	15	2	2.3%	44	4	1	2.3%	148	19	3	2.0%

Washington

General election defeats

There were 123 seats up for election in Washington. Overall, 104 incumbents advanced to the general election, including 58 Democrats and 46 Republicans. Of that total, nine incumbents lost—one Democrat and eight Republicans—representing 8.7% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Washington, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	45	0	0.0%	37	6	16.2%	82	6	7.3%
Senate	13	1	7.7%	9	2	22.2%	22	3	13.6%
Total	58	1	1.7%	46	8	17.4%	104	9	8.7%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Washington, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	64	8	12.5%	38	1	2.6%	102	9	8.8%
2012	53	1	1.9%	44	2	4.5%	97	3	3.1%
2014	63	4	6.3%	47	0	0.0%	110	4	3.6%
2016	51	0	0.0%	51	3	5.9%	102	3	2.9%
2018	58	1	1.7%	46	8	17.4%	104	9	8.7%

Primary defeats

There were 123 seats up for election in Washington. Overall, 106 incumbents filed for re-election, including 59 Democrats and 47 Republicans. Of that total, two incumbents lost in primaries—one Democrat and one Republican—representing 1.9% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Washington, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	46	9	1	2.2%	38	13	1	2.6%	84	22	2	2.4%
Senate	13	7	0	0.0%	9	5	0	0.0%	22	12	0	0.0%
Total	59	16	1	1.7%	47	18	1	2.1%	106	34	2	1.9%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Washington, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	65	21	1	1.5%	38	3	0	0.0%	103	24	1	1.0%
2012	53	10	0	0.0%	45	5	1	2.2%	98	15	1	1.0%
2014	63	15	0	0.0%	48	8	1	2.1%	111	23	1	0.9%
2016	52	16	1	1.9%	51	16	0	0.0%	103	32	1	1.0%
2018	59	16	1	1.7%	47	18	1	2.1%	106	34	2	1.9%

West Virginia

General election defeats

There were 117 seats up for election in West Virginia. Overall, 94 incumbents advanced to the general election, including 37 Democrats, 56 Republicans, and one independent. Of that total, 14 incumbents lost—four Democrats, nine Republicans, and one independent—representing 14.9% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in West Virginia, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	31	4	12.9%	48	7	14.6%	80	12	15.0%
Senate	6	0	0.0%	8	2	25.0%	14	2	14.3%
Total	37	4	10.8%	56	9	16.1%	94	14	14.9%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in West Virginia, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	74	5	6.8%	25	0	0.0%	99	5	5.1%
2012	64	7	10.9%	32	1	3.1%	96	8	8.3%
2014	54	22	40.7%	44	1	2.3%	98	23	23.5%
2016	34	8	23.5%	56	6	10.7%	90	14	15.6%
2018	37	4	10.8%	56	9	16.1%	94	14	14.9%

Primary defeats

There were 117 seats up for election in West Virginia. Overall, 99 incumbents filed for re-election, including 38 Democrats and 60 Republicans. Of that total, five incumbents lost in primaries—one Democrat and four Republicans—representing 5.1% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in West Virginia, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	32	15	1	3.1%	49	21	1	2.0%	82	36	2	2.4%
Senate	6	0	0	0.0%	11	4	3	27.3%	17	4	3	17.6%
Total	38	15	1	2.6%	60	25	4	6.7%	99	40	5	5.1%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in West Virginia, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	76	46	2	2.6%	27	6	1	3.7%	103	52	3	2.9%
2012	66	37	2	3.0%	32	8	0	0.0%	98	45	2	2.0%
2014	60	19	6	10.0%	46	15	1	2.2%	106	34	7	6.6%
2016	35	20	1	2.9%	58	18	1	1.7%	93	38	2	2.2%
2018	38	15	1	2.6%	60	25	4	6.7%	99	40	5	5.1%

Wisconsin

General election defeats

There were 116 seats up for election in Wisconsin. Overall, 98 incumbents advanced to the general election, including 35 Democrats and 63 Republicans. Of that total, one Democratic incumbent lost, representing 1.0% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Wisconsin, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	29	0	0.0%	55	0	0.0%	84	0	0.0%
Senate	6	1	16.7%	8	0	0.0%	14	1	7.1%
Total	35	1	2.9%	63	0	0.0%	98	1	1.0%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Wisconsin, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	51	13	25.5%	40	0	0.0%	92	13	14.1%
2012	34	2	5.9%	58	3	5.2%	92	5	5.4%
2014	36	3	8.3%	51	0	0.0%	87	3	3.4%
2016	39	2	5.1%	63	0	0.0%	102	2	2.0%
2018	35	1	2.9%	63	0	0.0%	98	1	1.0%

Primary defeats

There were 116 seats up for election in Wisconsin. Overall, 100 incumbents filed for re-election, including 37 Democrats and 63 Republicans. Of that total, two Democratic incumbents lost in primaries, representing 2.0% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Wisconsin, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	31	3	2	6.5%	55	1	0	0.0%	86	4	2	2.3%
Senate	6	0	0	0.0%	8	0	0	0.0%	14	0	0	0.0%
Total	37	3	2	5.4%	63	1	0	0.0%	100	4	2	2.0%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Wisconsin, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	52	6	1	1.9%	40	7	0	0.0%	93	13	1	1.1%
2012	36	9	2	5.6%	58	6	0	0.0%	94	15	2	2.1%
2014	36	2	0	0.0%	51	1	0	0.0%	87	3	0	0.0%
2016	39	8	0	0.0%	63	0	0	0.0%	102	8	0	0.0%
2018	37	3	2	5.4%	63	1	0	0.0%	100	4	2	2.0%

Wyoming

General election defeats

There were 75 seats up for election in Wyoming. Overall, 62 incumbents advanced to the general election, including nine Democrats and 53 Republicans. Of that total, four incumbents lost—two Democrats and two Republicans—representing 6.5% of incumbents who advanced to the general election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Wyoming, 2018
Chamber
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
House	7	1	14.3%	46	2	4.3%	53	3	5.7%
Senate	2	1	50.0%	7	0	0.0%	9	1	11.1%
Total	9	2	22.2%	53	2	3.8%	62	4	6.5%

Historical general election defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in general elections in Wyoming, 2010-2018
Year
	Democratic incumbents			Republican incumbents			Total incumbents
	Running	Def.	%	Running	Def.	%	Running	Def.	%
2010	18	7	38.9%	42	0	0.0%	60	7	11.7%
2012	9	1	11.1%	48	0	0.0%	57	1	1.8%
2014	9	0	0.0%	51	1	2.0%	60	1	1.7%
2016	9	2	22.2%	44	1	2.3%	53	3	5.7%
2018	9	2	22.2%	53	2	3.8%	62	4	6.5%

Primary defeats

There were 75 seats up for election in Wyoming. Overall, 65 incumbents filed for re-election, including nine Democrats and 56 Republicans. Of that total, three Republican incumbents lost in primaries, representing 4.6% of incumbents who filed for re-election.

Statistics from 2018 are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Wyoming, 2018
Chamber
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
House	7	0	0	0.0%	46	14	0	0.0%	53	14	0	0.0%
Senate	2	0	0	0.0%	10	5	3	30.0%	12	5	3	25.0%
Total	9	0	0	0.0%	56	19	3	5.4%	65	19	3	4.6%

Historical primary defeat statistics are shown below. Hover over column headings to learn more about their contents.

Incumbents defeated in primaries in Wyoming, 2010-2018
Year
	Democratic incumbents				Republican incumbents				Total incumbents
	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%	Filed	Cont.	Def.	%
2010	18	0	0	0.0%	42	15	0	0.0%	60	15	0	0.0%
2012	9	0	0	0.0%	51	21	3	5.9%	60	21	3	5.0%
2014	9	0	0	0.0%	55	26	4	7.3%	64	26	4	6.3%
2016	9	0	0	0.0%	46	20	3	6.5%	55	20	3	5.5%
2018	9	0	0	0.0%	56	19	3	5.4%	65	19	3	4.6%

See also

• Election results, 2018: State legislatures
• State legislative elections, 2018
  • Impact of term limits on state legislative elections in 2018
  • Open seats in state legislative elections, 2018
  • Contested state legislative primaries, 2018
  • State legislative incumbents in contested primaries, 2018
  • Major party competition in state legislative elections, 2018
  • State legislative incumbents without general election challengers, 2018
• Primary election competitiveness in state and federal government, 2018