Show Archive: http://www.c-span.org/Podcasts.aspx
Focus: Washington D.C. politics, non-fiction authors, Foundation and Think Tank policy discussions
Style: Interviews, Q+A, speeches, hearings, Congressional proceedings
C-SPAN is a non-profit cable channel dedicated to public affairs and funded by the cable industry. The page linked to collects six different podcast collections, ranging from interviews to political speeches, congressional debates, think tank and foundation discussions, and other matters, with a focus on mainstream Washington D.C. politics.