On Monday night, Donald Trump made his latest polarizing comment, saying it was “too disgusting†to talk about Hillary Clinton’s use of the bathroom during the last Democratic debate and that she had got “schlonged†by Barack Obama when she lost to him in the 2008 Democratic primary. Trump was surely talking off-the-cuff in his usual style — and the comments were criticized as offensive and sexist — but it was another example of his mastery in exploiting the psychological biases of conservatives who see much to dislike in today’s society and express support for Trump in the polls. In...