David Dayen on Drug Prices; Tom Frank: From Trump to Obama; Sean Wilentz: Bob Dylan's Xmas

Prescription drug prices are on the rise and two Senators are taking on the problem. Bernie Sanders has introduced a bill advancing generics; and last Tuesday, Elizabeth Warren introduced her own bill, promoting drug manufacture by the government. David Dayen explains--and also talks about Steve Mnuchin, the subject of his new book, "Fat Cat." Next, from Obama to Trump — what happened? Tom Frank explains. Lastly, the Bob Dylan Xmas album: Sean Wilentz, Princeton professor and official historian in residence at BobDylan.com, answers the question, "What the heck is this?"