Donald Trump has been blowing up the old traditional GOP certainties left and right, and this week he overturned another one. In what seemed like an embarrassing rebuke, on February 1, Adele told the Republican front-runner that he didn’t have her permission to use her songs at his massive campaign events. Adele might just be the world’s most popular singer at the moment, and any normal candidate would have folded his tent, chastened. Not Trump. At his rally in Little Rock, Arkansas two days later the crowd of thousands listened to Adele’s “Skyfall†before Trump’s helicopter landed. A day after...