This episode's headline: Campaign 2004; Big Bounce; Previewing Prairies. ANCHOR: JIM LEHRER; GUESTS: MARK SHIELDS; DAVID BROOKS; MATEA GOLD; KAREN TUMULTY; DAN BALZ; HEIDI NEUMARK; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN