This episode's headline: Mondale Picks Ferraro; NASA Mission Combined; Backyard Tinkerer. The guests include In Washington: NORMAN ORNSTEIN, Political Scientist; ALAN BARON, Democratic Political Analyst; DAVID GERGEN, Republican Political Analyst; In Los Angeles: GEORGE ALEXANDER, Los Angeles Times. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: CHARLAYNE HUNTER-GAULT, Correspondent; JUDY WOODRUFF, Correspondent; Reports from NewsHour Correspondents: ELIZABETH BRACKETT, in St. Paul