This episode's headline: Russian Roulette; Handicapping the Race; On the Stump; Tribute. The guests include STEPHEN COHEN, Princeton University; STEPHEN SESTANOVICH, Center For Strategic Studies; DAVID GERGEN, U.S. News & World Report; MARK SHIELDS, Washington Post; GERALD WARREN, San Diego Union; LEE CULLUM, Dallas Times-Herald; ED BAUMEISTER, Trenton Times; GOV. MICHAEL DUKAKIS, Dem. Presidential Nominee; CHARLES ADDAMS. Byline: In Washington: JAMES LEHRER; In New York: CHARLAYNE HUNTER- GAULT