This episode's headline: The Final Round; Perot In '92; Better Half?. The guests include MARK SHIELDS, Syndicated Columnist; DAVID GERGEN, U.S. News & World Report; EDDIE WILLIAMS, Political Analyst; LINDA DIVALL, Republican Pollster; PETER HART, Democratic Pollster; ED ROLLINS, Perot Campaign Co-Chair; HAMILTON JORDAN, Perot Campaign Co-Chair; CORRESPONDENT: ROGER ROSENBLATT. Byline: In New York: JAMES LEHRER; In Washington: JUDY WOODRUFF