This episode's headline: Nuclear Politics; Coup in Pakistan; Labor's Muscle; Dialogue; Good Vibes. ANCHOR: JIM LEHRER; GUESTS: MOYNIHAN, [D] New York; SEN. JOSEPH BIDEN, [D] Delaware; SEN. JON KYL, [R] Arizona; PAULA NEWBERG, Author; ROBERT OAKLEY, Former U.S. Ambassador, Pakistan; SEN. JOHN WARNER, Chairman, Armed Services Committee; SEN. DANIEL PATRICK; DORIS KEARNS GOODWIN, Presidential Historian; MICHAEL BESCHLOSS, Presidential Historian; HAYNES JOHNSON, Journalist/Author; THOMAS GEOGHEGAN, Labor Lawyer/Author; CORRESPONDENTS: SUSAN DENTZER; GWEN IFILL; KWAME HOLMAN; SPENCER MICHELS; ELIZABETH FARNSWORTH; PAUL SOLMAN; RAY SUAREZ; MARGARET WARNER; JEFFREY KAYE