David Plotz, Emily Bazelon and John Dickerson discuss the latest from the campaign trail just days ahead of the Iowa caucus, the liklihood of Michael Bloomberg entering the race as an independent candidate and Jane Mayer's new book, “Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right.” 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 80% 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 Credit Karma. Do not pay for your credit score! With Credit Karma, you can get your credit report, right now, absolutely free. Just visit CreditKarma.com/SAVE to get started! There are no strings attached and no credit card is required. And by Texture, the mobile app that lets you tap directly into the world's most popular magazines, anywhere, using your phone or tablet. Dive deeper into Vogue, People, Esquire, Time—and hundreds more. There's interactive content for a richer reading experience. Right now, try Texture for free at Texture.com/POLITICAL.  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: @SlateGabfest Facebook: facebook.com/Gabfest Email: gabfest@slate.com Show notes at slate.com/Gabfest Learn more about your ad choices. Visit megaphone.fm/adchoices