This episode's headline: What was Known; Supreme Court Watch; Candidates' RX; Atonement. ANCHOR: JIM LEHRER; GUESTS: SEN. CARL LEVIN; SEN. PAT ROBERTS; JAN CRAWFORD GREENBURG; SEN. BOB GRAHAM; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN