What’s the deal with Donald Trump? He can’t possibly think he has a chance against a dozen highly qualified candidates, all but one of whom have held elective office, from governor to senator, for years. He must know that after a tiny pop in the polls over the silly summer season (remember Howard Dean?), he’ll tumble back down to earth and disappear. True, Mr. Trump couldn’t care less how embarrassing he is — to the Republican Party, sure, but also to himself. He’s an egotistical narcissist just blowing some of his $7 billion while in between tapings of his god-awful...