The Ivory tower leans left.

"The tendency of liberals to pursue advanced education isn’t a result of higher I.Q. or less materialism or any such indirect factor,” Dr. Gross told me. He pointed instead to a direct factor: the liberal reputation of the profession since it came of age in the Progressive Era. “The liberalism of professors is explained mostly by self-selection,” Dr. Gross said, arguing that conservatives avoid fields with reputations that don’t fit their self-identity.