This episode's headline: Nuclear Deal; Words of Faith; Benefit Issues; Self Defense. ANCHOR: JIM LEHRER; GUESTS: GEORGE PERKOVICH; RICHARD KOHN; LT. COL. ROBERT MAGINNIS; ANNE COUGHLIN; RONALD ALLEN;CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN