Trump’s critics argue that he is playing to the basest instincts of disaffected voters, who hate foreigners (especially Mexicans), distrust bankers (or anyone with a higher education, for that matter), and still can’t get over the election of a president whose father was black. Trump, in the comedian Jon Stewart’s words, is “America’s id,” or at least the id of a large number of mostly white, mostly older, mostly small-town Americans.