Influential pundit Erick Erickson is the latest to do so.

Back in September, he wrote, “I would vote for Donald Trump over John Kasich. But as Kasich will not be the Republican nominee for President, I think it is also worth reiterating that I will vote third party before I’d vote for a ticket that has Kasich as Vice President. A Republican who believes Jesus told him to expand Obamacare is not fit for either the Presidency or to be one heart beat away from the Presidency.”

How times have changed!

Here’s an excerpt from his Monday column, “I Will Not Vote For Trump Ever.”

A lot of Republicans are going to start claiming that we must rally to the nominee, no matter who he is. I know for certain a large number of Trump supporters will not rally to a Cuban. I will not rally to Trump. If Trump is able to get the nomination, the Republican Party will cease to be the party in which I served as an elected official. It will not deserve my support and will not get it if it chooses to nominate a pro-abortion liberal masquerading as a conservative, who preys on nationalistic, tribal tendencies and has an army of white supremacists online as his loudest cheerleaders.

Erickson is hardly alone. Bill Kristol has mused about starting a new political party if Donald Trump wins the Republican nomination. It’s almost impossible to imagine George Will or Kevin Williamson supporting Trump. Glenn Beck declared, “I know that I won't go to the polls. I won't vote for Hillary Clinton and I won't vote for Donald Trump. I just won't. And I know a lot of people that feel that way.”

Here’s Peter Wehner back in January:

Beginning with Ronald Reagan, I have voted Republican in every presidential election since I first became eligible to vote in 1980. I worked in the Reagan and George H. W. Bush administrations and in the White House for George W. Bush as a speechwriter and adviser. I have also worked for Republican presidential campaigns, although not this time around. Despite this history, and in important ways because of it, I will not vote for Donald Trump if he wins the Republican nomination.

Wehner added:

I should add that neither could I vote in good conscience for Hillary Clinton or any of the other Democrats running for president, since they oppose many of the things I have stood for in my career as a conservative — and, in the case of Mrs. Clinton, because I consider her an ethical wreck. If Mr. Trump and Mrs. Clinton were the Republican and Democratic nominees, I would prefer to vote for a responsible third-party alternative; absent that option, I would simply not cast a ballot for president.

Joe Scarborough declared on Morning Joe, “I think Haley Barbour and a lot of the Republican leaders would much rather Hillary Clinton be President of the United States than have Donald Trump represent them as a Republican.” And it is hard to imagine any die-hard Bush loyalists supporting Trump after his attacks on Jeb and George. Indeed, it is easy to imagine them delighting in denying Trump the White House.