Romney is playing the long game, he is more popular in Utah than Joe Smith and they have already started running Mormon backed commercials praising him in Utah.

I agree, especially since 45's revenge is always such a wildcard. But I also suspect he's thinking of running against 45, and this was a way to appeal to the religious who aren't fond of Trump. Also, I wonder if he would have done it if it would have tied the vote?

High price but he's willing to pay, hopefully he retains office

...or, he may again run for president..

Trump and his legion of hate will make Romney’s life miserable as long as the Orange Moron is President. Romney knew it when he made his statement, probably one of the hardest things he ever has done knowing the consequences.