A century ago, Arthur Bentley wrote in The Process of Government that ideals are far less important to the political process than the collective actions and interactions of interest groups. Oversimplifying, that means that it doesn’t matter so much what politicians profess as what their supporters and adversaries do. According to Wikipedia, Bentley’s pluralist-behavioralist thinking was a major influence to the “Chicago School”, so named for the University of Chicago. Well, when it comes to Chicago, there are Schools, and there are schools – as this Presidential campaign amply demonstrates. Bentley’s thinking merely gives one a good way...