CONTENDERS Conventional Wisdom P Tsongas Regional, ideological balance. But Clinton camp still ticked at his N.Y. fandango. B. Bradley The all-Rhodes ticket. Popular across party lines, but didn’t serve in Vietnam, either. B. Kerrey As war hero, severe critic of Clinton, would salve wounds. But lackluster bid a minus. P. Simon Old CW: Fuddy-duddy. New CW: Bow-tied rectitude compensates for Slick Willie. C. Powell Military chief said to be a closet Dem. Ideal for Clinton, but CW can’t see him saying yes. W. Rudman Quitting Senate good career move. Now Perot’s sending out veep feelers.