Former Rep. Gabrielle Giffords, middle, gets a kiss from Emily Nottingham, right, mother of slain former Giffords staffer Gabe Zimmerman, as they and Giffords husband Mark Kelly, left, and other surviving shooting victims and family members of the slain 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, middle, gets a kiss from Emily Nottingham, right, mother of slain former Giffords staffer Gabe Zimmerman, as they and Giffords husband Mark Kelly, left, and other surviving shooting victims and family members of the slain 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, middle, gets a kiss from Emily Nottingham, right, mother of slain former Giffords staffer Gabe Zimmerman, as they and Giffords husband Mark Kelly, left, and other surviving shooting victims and family members of the slain 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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