This episode's headline: Big Decisions; Medicare RX; Shields and Brooks; Conversation. ANCHOR: JIM LEHRER; GUESTS: KIMBERLE CRENSHAW; JOHN YOO; DOUGLAS KMIEC; MARK SHIELDS; DAVID BROOKS;EVAN THOMAS; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN The recording of this episode is incomplete, and most likely the beginning and/or the end is missing.