Obama backs gun limits, concedes tough fight ahead - Article Photos 4/4

New York City Mayor Michael Bloomberg speaks at a gun violence summit at Johns Hopkins Bloomberg School of Public Health in Baltimore, Monday, Jan. 14, 2013, where he outlined his proposals for federal gun control reforms. Bloomberg urged President Barack Obama and Congress to increase background check requirements for firearms purchases, and also said the federal government needs to get tougher on gun trafficking. (AP Photo/Patrick Semansky)