Article Photos: Biden: Nation needs to respond to gun violence



Vice President Joe Biden crosses his fingers as U.S. Conference of Mayors President, Philadelphia Mayor Michael Nutter projected on a monitor, makes his remarks at the U.S. Conference of Mayors 81st winter meeting in Washington, Thursday, Jan. 17, 2013. (AP Photo/Manuel Balce Ceneta)

Vice President Joe Biden crosses his fingers as U.S. Conference of Mayors President, Philadelphia Mayor Michael Nutter projected on a monitor, makes his remarks at the U.S. Conference of Mayors 81st winter meeting in Washington, Thursday, Jan. 17, 2013. (AP Photo/Manuel Balce Ceneta)