'JFK'; Art Spiegelman; Martin Sheen

In a three-part conversation, journalist Nicholas Lemann, movie critic David Denby, and co-screenwriter Zachary Sklar debate Oliver Stone's controversial movie "JFK" as well as the facts surrounding the assassination of President John F. Kennedy. Cartoonist Art Spiegelman talks about his family history and his new book, "Maus II: A Survivor's Tale: And Here My Troubles Began." In a two-part interview, actor Martin Sheen on the Kennedy assassination, the United States' military interventions in Panama and Iraq, and his role as John Proctor in Arthur Miller's "The Crucible."