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



Vice President Joe Biden gestures as he addresses 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 gestures as he addresses at the U.S. Conference of Mayors 81st winter meeting in Washington, Thursday, Jan. 17, 2013. (AP Photo/Manuel Balce Ceneta)