After Chief Justice John Roberts said, in his speech at the IU school of law, that it's harder for the Supreme Court to reach consensus than it is for Congress, where compromise comes with the job. "In effect," the columnist noted, Roberts implied that "on some decisions a justice is conservative or liberal, and there isn't a lot of middle ground." Then he hunted up the dean of the law school, Gary Roberts, to ask him what makes people liberal or conservative: