John Dickerson, David Plotz and Emily Bazelon discuss the impact of the Iowa Caucus on the Republican and Democratic Parties and David Plotz speaks with Adam McKay about America's financial system and his Oscar-nominated film, The Big Short.The Slate Political Gabfest is brought to you by Stamps.com. Buy and print official U.S. postage using your own computer and printer, and save up to 50% compared to a postage meter. Sign up for Stamps.com and get a 4-week trial and a $110 bonus offer when you use the promo code GABFEST.And by Casper, an online retailer of premium mattresses for a fraction of the price. Casper mattresses come with free delivery and returns within a 100-day period. And get 50 dollars toward any mattress purchase by visiting Casper.com/POLITICALandusing the promo code POLITICAL.And by Harry's, the shaving company that offers German-engineered blades, well-designed handles, and shipping right to your door. Visit Harrys.com for $5 off your first purchase with the promo code GABFEST.Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at www.slate.com/gabfestplus.Twitter: @SlateGabfestFacebook: facebook.com/GabfestEmail: gabfest@slate.comShow notes at slate.com/gabfestLearn more about your ad choices. Visit megaphone.fm/adchoices