This episode's headline: Showdown; Capitol Conflicts; Gergen & Shields; News for Kids. The guests include GASTON SIGUR, Former State Department Official; PEI MINXIN, Student; KENNETH LIEBERTHAL, University of Michigan; DAVID GERGEN, U.S. News & World Report; MARK SHIELDS, Washington Post; REPORTS FROM NEWSHOUR CORRESPONDENTS: ROGER MUDD; HODDING CARTER. Byline: In New York: ROBERT MacNEIL; In Washington: JAMES LEHRER