NEW YORK - NOVEMBER 03: Supporters of New York City Mayor Michael Bloomberg ccelebrate as he walks onto stage after a narrow win over Democratic challenger William Thompson November 3, 2009 in New York City. This will be Bloomberg's third ...

Candidates for the Office of New York City Mayor, incumbent Michael Bloomberg., left, and challenger, Democratic Mayoral candidate William Thompson, shake hands after their televised debate in New York, Tuesday, Oct. 27, 2009. (AP Photo/Pool, James Estrin)

FILE - In this Sept. 24, 2009 file photo, New York City Comptroller and mayoral candidate William Thompson Jr. address a crowd at the "Stand for Freedom in Iran" rally against Iranian president Mahmoud Ahmadinejad near the United Nations headquarters in ...

New York City Comptroller and Democratic mayoral candidate William Thompson, Jr., addresses moderator, NY-1 anchor person Dominic Carter, left, as Thompson's opponent, New York City Councilman Tony Avella, listens during the Democratic Mayoral Debate at the New York Public ...