SUPPORTING President Bush is not just socially suicidal in this town — it can endanger your career and cost you big bucks, as one cabby discovered the hard way. Haitian-born Etzer Jerome was fined $500 and had his license suspended three weeks — a loss of some $5,000 — simply because, he says, he committed a new kind of infraction: Backing Bush While Black. "I'm a Bush man," Jerome, 49, told me while recounting a story that couldn't happen anyplace else. [snip] Elizabeth Grainger asked for a ride to 116th Street. He dropped his sandwich, and they drove off....