On Fireside Chats, Mark and Tevi think about think tanks. Tevi argues that think tanks have become too politicized. Do the think tanks that claim ideological diversity actually hew to a partisan line? They discuss the battle for the control of Cato, and Mark argues that the right has sought to discredit expertise. How much influence do funders have over what think tanks produce? They debate whether the liberal Center for American Progress has become merely a mouthpiece for the Obama administration and take a closer look at Cato's claims of ideological independence.