This episode's headline: Power Vacuum; Media Merger; Affirmative Action; Conversation. ANCHOR: JIM LEHRER; GUESTS: HERMAN COHEN, Former State Department Official; PETER ROSENBLUM, Harvard University; SALIH BOOKER, Council on Foreign Relations; STUART TAYLOR, The American Lawyer; WYNTON MARSALIS, Pulitzer Prize Winner, Music; CORRESPONDENTS: ALEX THOMPSON; MARGARET WARNER; JEFFREY KAYE; CHARLAYNE HUNTER-GAULT;