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Associated Press
FILE - In this Jan. 14, 2013, file photo, New York City Mayor Michael Bloomberg speaks at a gun violence summit at Johns Hopkins Bloomberg School of Public Health in Baltimore. On Saturday, March 23, 2013, Bloomberg announced on a new $12 million television ad campaign from Mayors Against Illegal Guns will push senators in key states to back gun control efforts including comprehensive background checks. (AP Photo/Patrick Semansky, File)

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