Christopher P. Gilbert is an assistant professor of political science at Gustavus Adolphus College, St. Peter. He is the author of The Impact of Churches on Political Behavior, and a frequent political commentator for Minnesota Public Radio and KTCA-TV. Where Have All the Moderates Gone Cohen, Bradley, Nunn, Kassebaum, Hoyer…..the list of moderate lawmakers announcing their impending departure from Washington reads like a Who’s…