This episode's headline: Supreme Showdown; Regional Views; Crude Economics; Grounded. ANCHOR: JIM LEHRER; GUESTS: STUART TAYLOR; PAM KARLAN; JOHN YOO; ANTHONY LEWIS; ROBERT KITTLE; CYNTHIA TUCKER; FRANK BURGOS; BRUCE DOLD; MARK THOMPSON; DAVID S. HARVEY; CORRESPONDENTS: FRED DE SAM LAZARO; BETTY ANN BOWSER; SUSAN DENTZER; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN