This episode's headline: End of America; '92 Election. The guests include DAVID GERGEN, U.S. News & World Report; MARK SHIELDS, Syndicated Columnist; LINDA DIVALL, Republican Pollster; PETER HART, Democratic Pollster; EDDIE WILLIAMS, Political Analyst; CORRESPONDENT: JUDY ASLETT. Byline: In New York: JUDY WOODRUFF; In Washington: JAMES LEHRER