Some time ago I contrasted the reaction a conservative would get if he were in the same room with the two most consequential politicians of the 1990s, Bill Clinton and Rudy Giuliani. If you were in a room with Bill Clinton, he would discover the one issue out of 100 on which you agreed; he would probe you with questions, comments, suggestions; and he would tell you that you enabled him to understand it far better than he ever had before. If you were in a room with Rudy Giuliani, he would discover the one issue out of 100 on...