Former Rep. Gabrielle Giffords, center, is joined by her husband Mark Kelly, left, and Emily Nottingham, mother of shooting victim Gabe Zimmerman, listening to a speaker 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, center, is joined by her husband Mark Kelly, left, and Emily Nottingham, mother of shooting victim Gabe Zimmerman, listening to a speaker 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, center, is joined by her husband Mark Kelly, left, and Emily Nottingham, mother of shooting victim Gabe Zimmerman, listening to a speaker 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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