This episode's headline: Clean Sweep; BattleTested; Cartoons That Work; The Tennessee Waltz. ANCHOR: JIM LEHRER; GUESTS: SEN. TOM HARKIN, Iowa, Gore Supporter; ROBERT REICH, Bradley Supporter; SEN. CHUCK HAGEL, Nebraska, McCain Supporter; GOV. PAUL CELLUCCI, Massachusetts, Bush Supporter;CORRESPONDENTS: TERENCE SMITH; BETTY ANN BOWSER; SUSAN DENTZER; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; FRED DE SAM LAZARO; GWEN IFILL; TERENCE SMITH; ROGER ROSENBLATT; KWAME HOLMAN