Former Rep. Gabrielle Giffords, front left, holds a bouquet of flowers as she and her husband, Mark Kelly, right, and other shooting victims of the Tucson mass shooting, and family members join her as they returned to the site of a shooting that left her critically wounded to urge key senators to support expanded background checks for gun purchases, Wednesday, March 6, 2013, in Tucson, Ariz. (AP Photo/Ross D. Franklin)

Associated Press
Former Rep. Gabrielle Giffords, front left, holds a bouquet of flowers as she and her husband, Mark Kelly, right, and other shooting victims of the Tucson mass shooting, and family members join her as they returned to the site of a shooting that left her critically wounded to urge key senators to support expanded background checks for gun purchases, Wednesday, March 6, 2013, in Tucson, Ariz. (AP Photo/Ross D. Franklin)
Former Rep. Gabrielle Giffords, front left, holds a bouquet of flowers as she and her husband, Mark Kelly, right, and other shooting victims of the Tucson mass shooting, and family members join her as they returned to the site of a shooting that left her critically wounded to urge key senators to support expanded background checks for gun purchases, Wednesday, March 6, 2013, in Tucson, Ariz. (AP Photo/Ross D. Franklin)
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