The question was about climate change. The answer soon turned to the Bible. And Pete Buttigieg knew the verses. “There’s a lot about the stewardship of creation that is in Scripture that I don’t see being honored by the administration right now, not to mention the stuff about loving your neighbor and taking care of the least among us and feeding the poor,” the South Bend, Indiana, mayor said. The crowd of about 250 at a Mississippi River park in southeastern Iowa this month erupted with cheers. Republicans for a half century have built a loyal following among white evangelical...