I Voted for Trump. And I Sorely Regret It.

When Donald Trump first announced his presidential campaign, I, like most people, thought it would be a short-lived publicity stunt. A month later, though, I happened to catch one of his political rallies on C-Span. I was riveted.

I supported the Republican in dozens of articles, radio and TV appearances, even as conservative friends and colleagues said I had to be kidding. As early as September 2015, I wrote that Mr. Trump was “the most serious candidate in the race.” Critics of the pro-Trump blog and then the nonprofit journal that I founded accused us of attempting to “understand Trump better than he understands himself.” I hoped that was the case. I saw the decline in this country — its weak economy and frayed social fabric — and I thought Mr. Trump’s willingness to move past partisan stalemates could begin a process of renewal.

It is now clear that my optimism was unfounded. I can’t stand by this disgraceful administration any longer, and I would urge anyone who once supported him as I did to stop defending the 45th president.

Far from making America great again, Mr. Trump has betrayed the foundations of our common citizenship. And his actions are jeopardizing any prospect of enacting an agenda that might restore the promise of American life.

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What, you may wonder, especially in the wake of Charlottesville, Va., did I possibly see in this candidate?

Although crude and meandering for almost all of the primary campaign, Mr. Trump eschewed strict ideologies and directly addressed themes that the more conventional candidates of both parties preferred to ignore. Rather than recite paeans to American enterprise, he acknowledged that our “information economy” has delivered little wage or productivity growth. He was willing to criticize the bipartisan consensus on trade and pointed out the devastating effects of deindustrialization felt in many communities. He forthrightly addressed the foreign policy failures of both parties, such as the debacles in Iraq and Libya, and rejected the utopian rhetoric of “democracy promotion.” He talked about the issue of widening income inequality — almost unheard of for a Republican candidate — and didn’t pretend that simply cutting taxes or shrinking government would solve the problem.