New York City Mayor Michael Bloomberg acknowledges applause during the U.S. Conference of Mayors 81st winter meeting in Washington, Friday, Jan. 18, 2013. At left is U.S. Conference of

 

              New York City Mayor Michael Bloomberg acknowledges applause during the U.S. Conference of Mayors 81st winter meeting in Washington, Friday, Jan. 18, 2013. At left is U.S. Conference of
New York City Mayor Michael Bloomberg acknowledges applause during the U.S. Conference of Mayors 81st winter meeting in Washington, Friday, Jan. 18, 2013. At left is U.S. Conference of Mayors President. Philadelphia Mayor Michael Nutter (AP Photo/Manuel Balce Ceneta)