7PM This episode's headline: Ballots and Bullets; Risky Business; Capital Crime. The guests include SEN. MITCH MC CONNELL, [R] Kentucky; REP. TONY COELHO, [D] California; REP. STAN PARRIS, [R] Virginia; MAYOR MARION BARRY, Washington, D.C.; CORRESPONDENTS: CHARLES KRAUSE; DAN GIFFORD; KWAME HOLMAN. Byline: In Washington: JAMES LEHRER; In New York: CHARLAYNE HUNTER- GAULT