An attendee looks through the scope of a Freedom Group Inc.... Photo d'actualitéAmérique du Nord,Arme à feu,Armement,Continent américain,Contrôle des armes à feu,George R. Brown Convention Center,Gouvernement,Horizontal,Houston,National Rifle Association,Point de mire,Politique,Regarder,Région de la Côte du Golfe,Texas,Victime,Violence,États-UnisPhotographer Collection: Bloomberg 2013 BloombergAn attendee looks through the scope of a Freedom Group Inc. Bushmaster rifle during the 2013 National Rifle Association (NRA) Annual Meetings & Exhibits at the George R. Brown Convention Center in Houston, Texas, U.S., on Saturday, May 4, 2013. After the U.S. Senate defeated a proposed expansion of background checks on gun purchases, the NRA's annual conference has a celebratory atmosphere. Yet as the festivities began, gun-control advocates swarmed town halls, organizing petitions and buying local ads to pressure senators from Alaska to New Hampshire to reconsider the measure that failed by six votes on April 17. Photographer: Aaron M. Sprecher/Bloomberg via Getty Images