Andrew Sullivan gave a cogent and provocative speech this week at Cato based on his new book The Conservative Soul: How We Lost It, How to Get It Back. Prodded by a critique from David Brooks, he sharpened and clarified his argument during the question-and-answer session. Together, Sullivan and Brooks produced the kind of vigorous and intelligent discussion that think tanks strive for. You can catch the debate in RealAudio, RealVideo, or MP3 here. Or if you prefer shorter bites on YouTube, you can find the first part of Andrew's opening remarks here, the second part here, a closing back-and-forth with Brooks on conservatism, limited government, and the failure of the 1994 Republican Revolution here, and a short colloquy on same-sex marriage here. Finally, watch for the whole thing to appear on C-SPAN's Book TV soon.