David Campbell is the Packey J. Dee Professor of American Democracy at the University of Notre Dame and the chairperson of the political science department. His most recent book is Seeking the Promised Land: Mormons and American Politics (with John Green and Quin Monson). He is also the co-author (with Robert Putnam) of American Grace: How Religion Divides and Unites Us, which has been described by the New York Times as intellectually powerful, by America as an instant classic and by the San Francisco Chronicle as the most successfully argued sociological study of American religion in more than half a century.