It is an interesting vote, he likely just ended his career. The majority of Utah Democrat and Republican, are against the impeachment. And over half of the population support Trump. With Republicans that percentage obviously is quite different.
Personally I believe his vote has a lot more to do with his overall dislike of Trump than anything else. I do believe that.
Do you think Romney knows the abuse of power charge is bogus but is voting for it anyways and sacrificing his career just because he doesn’t like Trump?
I think he has convinced himself that his vote has nothing to do with any of those things, but of course people convince themselves of all manner of things that are untrue.
It is widley known Mitt does not like Trump. He has not hid that fact. I do believe he is jealous of Trumps win, and probably has a difficult time understanding how did someone like Trump win and he did not.