The University of Iowa's history department and Duke's history department have a couple of things in common. Both have made national news because neither has a Republican faculty member. And both rejected the application of Mark Moyar, a highly qualified historian and a Republican, for a faculty appointment. Moyar graduated first in the history department at Harvard; his revised senior thesis was published as a book and sold more copies than an average history professor ever sells. After earning a Ph.D. from Cambridge University in England, he published his dissertation as "Triumph Forsaken: The Vietnam War, 1954-1965" with Cambridge University...