This episode's headline: Difference of Opinion; Enforcing the Blockade; To the Front. The guests include PRINCE BANDAR BIN SULTAN, Ambassador, Saudi Arabia; ABRAHAM SOFAER, FormerState Deparment Official; VICE ADMIRAL THOR HANSON, U.S. Navy [Ret.]; REAR ADM. EUGENE J. CARROLL, JR., U.S. Navy [Ret.]; ABDUL AMIR AL-ANBARI, U.N. Ambassador, Iraq; DAVID MIZRAHI, Middle East Analyst; ANDY BELLINGHAM, Agriculture Analyst; JOHN ABINADER, U.S.-Arab Chamber of Commerce; CORRESPONDENTS: ELIZABETH BRACKETT; ROGER MUDD. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER