PEN Writers Protest; Sen. Warren's Influence on Hillary; Food Industry Changes

Sen. Elizabeth Warren isn't even running for president -- but she's having an effect on the Clinton campaign anyway. The New Yorker's Ryan Lizza discusses how and why. Plus: Hillary Clinton's communications director Jennifer Palmieri responds to the stories that have been circulating for the past week; the novelist Francine Prose explains why she withdrew her support for the PEN gala after the organization announced it's giving a freedom of expression award to the French satirical newspaper Charlie Hebdo, then PEN's president-elect Andrew Solomon talks about the state of free expression; NYU nutrition and public health professor Marion Nestle looks at whether the changes some big food companies are making -- like Chipotle not using GMOs or Pepsi not using the sweetener aspartame -- are motivated by health or the bottom line; a Muslim scholar and a secular American explore the most controversial elements of the Quran and comedians Dean Obeidallah and Negin Farsad discuss their new campaign "Fighting-Bigotry-With-Delightful-Posters."