Iowa Caucus Recap; Michael Milken; Matthew Heineman

Matthew Dowd, Frank Bruni, David Axelrod, and Susan Glasser recap the Iowa caucus, in which Ted Cruz defeated Donald Trump and Hillary Clinton survived a surprisingly close race. A conversation with Michael Milken, chairman of the Milken Institute, a nonprofit think tank focused on medical research and public health. Matthew Heineman presents "Cartel Land," his documentary about the struggle to end the Mexican drug war.