Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the National Rifle Association convention in St. Louis, Friday, April 13, 2012. (AP Photo/Michael Conroy)

Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the National Rifle Association convention in St. Louis, Friday, April 13, 2012. (AP Photo/Michael Conroy)
Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks at the National Rifle Association convention in St. Louis, Friday, April 13, 2012. (AP Photo/Michael Conroy)
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