NEW YORK (AP) Billionaire Mayor Michael Bloomberg has won a surprisingly close reelection in a race that was supposed to be a lot easier and he's pledging to work even harder for New York City.

The closeness of the race may have exposed lingering anger over his reversal on term limits and his prodigious campaign spending.

Bloomberg won by just five percentage points and promised that New Yorkers "ain't seen nothing yet" from him.

City Comptroller William Thompson hammered the mayor relentlessly on term limits, saying Bloomberg went back on his word when he orchestrated a change to allow him to run again. Voters had upheld a term-limits law by referendum twice in the 1990s.

Simmering voter resentment this year may have energized the political opposition in City Hall, with Democrats suggesting that Bloomberg's third term could be his most difficult.

Bloomberg is only the fourth New York mayor ever to win a third term.

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