This episode's headline: Turning Point; Bar None; American Visions. ANCHOR: JIM LEHRER; GUESTS: MICHAEL BESCHLOSS, Presidential Historian; DORIS KEARNS GOODWIN, Presidential Historian; HAYNES JOHNSON, Journalist/Author; HOWARD BAKER, Senate Watergate Committee; REP. CHARLES RANGEL, Judiciary Committee [1971-1974]; ROBERT HUGHES, Time Magazine; CORRESPONDENTS: KWAME HOLMAN; ELIZABETH BRACKETT; PAUL SOLMAN;
