As Americans have become more polarized, has Hollywood shied away from telling overtly political stories? Turner Classic Movies host Ben Mankiewicz talks with actor Martin Sheen, who famously played a president on the long-running TV series “The West Wing”; with film professor Annette Insdorf and critic Michael Schulman, about Hollywood’s long tradition of political films; and former studio head Michael Lynton, on the thinking behind risk-averse film studios.