This episode's headline: Ups & Downs; Judging Thomas; Gergen & Shields. The guests include JAMES GRANT, Financial Writer; DAVID BOSTIAN, Economist; SEN. HOWELL HEFLIN, [D] Alabama; SEN. ARLEN SPECTER, [R] Pennsylvania; DAVID GERGEN, U.S. News & World Report; MARK SHIELDS, Washington Post; CORRESPONDENT: KWAME HOLMAN. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER