FILE - In this March 6, 2013 file photo, former Rep. Gabrielle Giffords, left, listens to her husband Mark Kelly, right, during a return to the supermarket where she was wounded in a rampage two years ago in Tucson, Ariz. Kelly went to a Tucson gun store a week ago to buy a .45-caliber handgun and a military-style rifle the day before the appearance. It didn't take long for the purchase to draw criticism from gun-rights supporters. (AP Photo/Ross D. Franklin, File)

Associated Press
FILE - In this March 6, 2013 file photo, former Rep. Gabrielle Giffords, left, listens to her husband Mark Kelly, right, during a return to the supermarket where she was wounded in a rampage two years ago in Tucson, Ariz. Kelly went to a Tucson gun store a week ago to buy a .45-caliber handgun and a military-style rifle the day before the appearance. It didn't take long for the purchase to draw criticism from gun-rights supporters. (AP Photo/Ross D. Franklin, File)
FILE - In this March 6, 2013 file photo, former Rep. Gabrielle Giffords, left, listens to her husband Mark Kelly, right, during a return to the supermarket where she was wounded in a rampage two years ago in Tucson, Ariz. Kelly went to a Tucson gun store a week ago to buy a .45-caliber handgun and a military-style rifle the day before the appearance. It didn't take long for the purchase to draw criticism from gun-rights supporters. (AP Photo/Ross D. Franklin, File)
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