This episode's headline: Cleaning Up?; Shields & Brooks; Missing; Tennis. ANCHOR: JIM LEHRER; GUESTS: RICHARD SYRON; PETER PETERSON; WILLIAM GEORGE; MARK SHIELDS; DAVID BROOKS; GRETA VAN SUSTEREN; KEITH WOODS; ROBERT PINSKY; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN