The leaked video of Donald Trump’s lecherous musings had only been on the internet for a few hours Friday when the Mormon backlash began. “I’m out,” Utah congressman Jason Chaffetz told a local news anchor in Salt Lake City. “I can no longer in good conscience endorse this person for president. It is some of the most abhorrent and offensive comments that you can possibly imagine.” The interview made Chaffetz the first Republican in Congress to officially retract his endorsement of Trump, and by next day he would be joined by dozens of his colleagues across the country. But in...