This episode's headline: Under Fire; Duking It Out; Gergen & Shields. The guests include JOHN MAGINNIS, Louisiana Political Report; LARRY ENGLISH, Shreveport Journal; FOCUS - GERGEN & SHIELDS: DAVID GERGEN, U.S. News & World Report; MARK SHIELDS, Washington Post; CORRESPONDENTS: PAUL DAVIES; BETTY ANN BOWSER;. Byline: In New York: ROBERT MacNeil; In Washington: JUDY WOODRUFF