Why does everybody assume Johnson will win Utah? I'm guessing Mormons wouldn't like Johnson that much more than Trump.
True. Mormons typically won't go for someone who's pro-LGBT, pro-choice, pro-weed, and wants to lower the drinking age to 18.
If Gary Johnson got Romney's endorsement he would win Utah
Not necessarily. Endorsements haven't done much good for candidates during the course of this cycle. Rubio didn't do s*** after many pols endorsed him. Same with Cruz. Bernie did remarkably well despite lack of endorsements.