As senator Alfonse D’Amato strode to the lectern at the Waldorf-Astoria to announce his run for a fourth term, he was accompanied by the familiar theme song from Rocky. The Philly brawler – an archetypal near-loser who achieves victory only at the very last, arena-rock-drenched moment – is a fitting role model for the Fonz. His political life has always followed that pattern. But this year, he has a problem: He’s the favorite. And that means he’s in a position to blow it. Meanwhile, the Democratic field is chock-full of career underdogs. Somehow, the Fonz has got to seize the lower ground, get his poll numbers plunging, so he can come swinging back. Most of all, he needs a lethal opponent, someone who can play the Ivan Drago role, the robotic, blond-spiked anti-hero of Rocky IV. Maybe there’s still time for Rudy to get in the race.