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McCain ran in 2008. At that time, Donald Trump was a registered Democrat. He didn't switch to Republican until 2009. Indeed he did endorse him, but why? He really liked Hillary Clinton, described himself as a "big fan" of Hillary, and thought that not picking Hillary as a running mate hurt Obama.

His words were: "The fact is that Obama went limping across the finish line. He should have chosen Hillary, it would have been a much different race, I believe. Right now, it looks to me like McCain is probably winning."

And Trump only likes winners. Perhaps that is why, even as a registered Democrat at the time and a big fan of Hillary, he endorsed McCain.

As for endorsing Romney -- Trump switched to the Republican party in 2011. Romney was and is a functional Democrat registered as a Republican. Trump's endorsement of Romney was par for the course.