Ray Suarez reports on Tuesday's closing arguments in the perjury trial of Lewis ""Scooter"" Libby. Then, Suarez speaks with Carol Leonnig of the Washington Post, who has been in the courtroom throughout the trial. Gwen Ifill reports on the proposed merger between Sirius and XM satellite radio services. The guests this episode are Carol Leonnig, Josh Bernoff, Kendall Harmon, Susan Russell. Byline: Jim Lehrer, Ray Suarez, Gwen Ifill, Paul Solman, Margaret Warner
