"It's hard to exaggerate how famous he was in the last two decades of the 19th century," our guest Susan Jacoby says of Robert Ingersoll, the subject of her new book, The Great Agnostic: Robert Ingersoll and American Freethought. But Ingersoll, once a "mover and shaker" in the Republican Party, is largely forgotten today. Why? He spoke out in favor of the separation of church and state and promoted Darwin's theory of evolution, and because ...