This episode's headline: Budget Impasse; Debtor Nation; Political Wrap; Nigerian Execution; Megabooks. ANCHOR: JAMES LEHRER; GUESTS: DAVID JONES, Wall Street Economist; KENNETH G. LANGONE, Investment Banker; MARK SHIELDS, Syndicated Columnist; PAUL GIGOT, Wall Street Journal; JEAN HERSKOVITS, Africa Analyst; MAUREEN O'BRIEN, Publishers Weekly; CORRESPONDENTS: PAUL SOLMAN; CHARLAYNE HUNTER-GAULT; JAMES MATES; ELIZABETH FARNSWORTH