What is it with Mayors of New York?

Bloomberg poised for third-party campaign - and he is going to spend $1 billion of his own money. And perhaps he'll run with Chuck Hagel. How would it play out? One scenario is good for the Democrats:

"If the Republicans nominate someone the press can tag as a pro-war social conservative and the Democrats pick an anti-war liberal, Bloomberg will run up the center," Mr. Goldman said. "If conservatives don't rally to stop Giuliani they will get a third party socially conservative candidate who will only help elect the Democrat."