This fall four new studies of professors' political attitudes showed a large tilt to the left: • Daniel Klein, an economics professor and researcher at Santa Clara University and Stockholm University, surveyed more than 1,000 professors around the United States and found Democrats outnumbering Republicans at least 7-1 in the humanities and social sciences, with departments such as anthropology and sociology coming in at about 30-1. • In a separate study of voter registration records, Mr. Klein found professors at Stanford and the University of California-Berkeley tilted Democratic 9-1. Among younger professors at those two universities the imbalance was even...