As the first arctic blast of January weather whipped through town last week, the city was chilled by news that Iowans had frozen out New York’s candidates for the White House. Hillary Clinton’s last-minute plea on the first post-hibernation Letterman show —starring Dave’s new reindeer-wrangler beard—failed to help her, and she finished behind Barack Obama and John Edwards. Rudy Giuliani finished sixth behind Mike Huckabee but had left Iowa five days before the caucus anyway. Dark horse Michael Bloomberg denied that there was any significance in his attendance at a caucus of potential third-party candidates, though he took pokes at the front-runners’ lack of ideas. Fourth-place finisher Fred Thompson, who’s probably wishing he’d never quit as New York’s fictional D.A., lost his old Law & Order job to Sam Waterston.