Larry Wilmore discusses Bill Cosby, being a "blerd" (black nerd), and the advice Jon Stewart gave him. He hosts his 100th episode of 'The Nightly Show' this week. John Powers reviews the new documentary 'Best of Enemies' about the 1968 debates between William F. Buckley and Gore Vidal — who hated each other. Actress Lily Tomlin stars in the film 'Grandma' and with Jane Fonda in the Netflix series 'Grace and Frankie.' We discuss her life and work, including her marrying her long, long time partner Jane Wagner a year and a half ago.