In this June 12, 2008, file photo, New York City Mayor Michael Bloomberg, center, is greeted by Senate Banking, Housing and Urban Affairs Committee Chairman Sen. Christopher Dodd, D-Conn., left, and the committee's ranking Republican Sen. Richard Shelby, R-Ala., as he arrives on Capitol Hill in Washington, to testify before the committee's hearing on the condition of the nation's infrastructure. Now that President Bush and Congress have cut hard-fought deals on terrorist surveillance and Iraq war funding, a massive housing rescue is likely the last major initiative with a chance of enactment this year before lawmakers scatter to campaign for re-election. Bush has threatened to veto the bill, but lawmakers in both parties call it a political imperative, and key players still see the makings of a summertime bargain. (AP Photo/Susan Walsh)

In this March 27, 2008 file photo, New York Mayor Michael Bloomberg, left, shakes hands with Democratic presidential candidate Sen. Barack Obama, D-Ill., after he introduced him in the Great Hall of New York's Cooper Union. Bloomberg urged Jewish voters to denounce the whisper campaign that for months has pushed the false rumor that Democratic presidential candidate Barack Obama is secretly a Muslim. (AP Photo/Richard Drew, File)

In this March 27, 2008 file photo, New York Mayor Michael Bloomberg, left, shakes hands with Democratic presidential candidate Sen. Barack Obama, D-Ill., after he introduced him in the Great Hall of New York's Cooper Union. Bloomberg urged Jewish voters to denounce the whisper campaign that for months has pushed the false rumor that Democratic presidential candidate Barack Obama is secretly a Muslim. (AP Photo/Richard Drew, File)

New York Mayor Michael Bloomberg, left, speaks while California Gov. Arnold Schwarzenegger smiles during a luncheon in New York, Thursday, April 17, 2008. With the help of Schwarzenegger, Bloomberg was introducing the 2008 New York City Card, a guide for political donors detailing pending state and federal issues that effect the city. (AP Photo/Seth Wenig)

New York City Mayor Michael Bloomberg speaks with a guest during a luncheon in New York, Thursday, April 17, 2008. With the help of California Gov. Arnold Schwarzenegger, Mayor Bloomberg introduced the 2008 New York City Card, a guide for political donors detailing pending state and federal issues that effect the city. (AP Photo/Seth Wenig)

New York Mayor Michael Bloomberg, left, shakes hands with Democratic presidential hopeful Sen. Barack Obama, D-Ill., after he introduced him in the Great Hall of New York's Cooper Union, Thursday, March 27, 2008. (AP Photo/Richard Drew)

New York Mayor Michael Bloomberg, top, former Federal Reserve Chairman Paul Volcker, foreground, and others, listen as presidential hopeful Sen. Barack Obama, D-Ill., speaks about the economy, Thursday, March 27, 2008, in the Great Hall of New York's Cooper Union. (AP Photo/Richard Drew)

New York Mayor Michael Bloomberg, left, shakes hands with Democratic presidential hopeful Sen. Barack Obama, D-Ill., after he introduced him in the Great Hall of New York's Cooper Union, Thursday, March 27, 2008. (AP Photo/Richard Drew)

New York City Mayor Michael Bloomberg gestures while speaking during The Mayors Summit on Reentry and Employment Thursday, Feb. 28, 2008 in New York. Bloomberg has squashed for good the possibility of running as an independent in this year's presidential race, declaring in a newspaper editorial that he will not seek the White House but might support another candidate who embraces bipartisan governing. (AP Photo/Frank Franklin II)

New York City Mayor Michael Bloomberg gestures while speaking during The Mayors Summit on Reentry and Employment Thursday, Feb. 28, 2008 in New York. Bloomberg has squashed for good the possibility of running as an independent in this year's presidential race, declaring in a newspaper editorial that he will not seek the White House but might support another candidate who embraces bipartisan governing. (AP Photo/Frank Franklin II)