Trump might also want to praise the Khans, the couple who lost a son in Iraq and whose sacrifice he mocked by likening it to what it cost him to build his business. He might also want to say he was wrong to suggest a certain judge could not fairly preside over a case involving Trump University because he was of Hispanic ancestry. Trump was wrong, too, to turn the presidential race into one of schoolyard taunts — "Little Marco," "Crooked Hillary" and the rest. In short, Trump might want to institute a policy of acting presidential. Now, that would be a reversal.