This episode's headline: Peacemaking; Public Opinions; View from Denver; Polling Opinion; Mixed Emotions; Worm Infested; AIDS Vaccine. ANCHOR: JIM LEHRER; GUESTS: ANDREW KOHUT; RICHARD SMITH; DAN SCHRADER; CORRESPONDENTS: FRED DE SAM LAZARO; ELIZABETH BRACKETT; CHARLES KRAUSE; MARGARET WARNER; PHIL PONCE; BETTY ANN BOWSER; KWAME HOLMAN