Mark Lempke, Author of "My Brother's Keeper: George McGovern and Progressive Christianity" joins me today to discuss the influence of the social gospel on George McGovern and how this message might resonate today. Mark is a historian of post-war religion and politics. He specializes in progressive Christianity and the Christian left that developed in the 1960's and 70's. He completed his Ph.D. from the State University of New York in Buffalo and taught on the SUNY campus in Singapore before he moved back to Rochester NY. Mark and I discussed the importance of Walter Rauschenbusch on McGovern's thought and politics.