Attendees move throughout the exhibition hall in the George R. Brown Center during the National Rifle Association's annual convention Friday, May 3, 2013 in Houston. (AP Photo/Steve Ueckert)

Associated Press
Attendees move throughout the exhibition hall in the George R. Brown Center during the National Rifle Association's annual convention Friday, May 3, 2013 in Houston. (AP Photo/Steve Ueckert)
Attendees move throughout the exhibition hall in the George R. Brown Center during the National Rifle Association's annual convention Friday, May 3, 2013 in Houston. (AP Photo/Steve Ueckert)
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