This episode's headline: George Bush Interview; Hazardous Duty; David Mamet Interview. The guests include In Washington: Vice President GOERGE BUSH, Presidential Candidate; In New York: PATRICIA NEIGHMOND, National Public Radio; DAVID MAMET, Writer; REPORTS FROM NEWSHOUR CORRESPONDENTS: JUDY WOODRUFF, KWAME HOLMAN. Byline: In New York: ROBERT MACNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor