Former Arizona Rep. Gabrielle Giffords, who was seriously injured in the mass shooting that killed six people in Tucson, Ariz. two years ago, arrives on Capitol Hill in Washington, Wednesday, Jan. 30, 2013, for a hearing of the Senate Judiciary Committee hearing on gun violence. She is escorted by her husband, Mark Kelly, right, a retired astronaut, Committee Chairman Sen. Patrick J. Leahy, D-Vt., second from left, and the committee's ranking Republican, Sen. Chuck Grassley, R-Iowa, left. (AP Photo/J. Scott Applewhite)

Associated Press
Former Arizona Rep. Gabrielle Giffords, who was seriously injured in the mass shooting that killed six people in Tucson, Ariz. two years ago, arrives on Capitol Hill in Washington, Wednesday, Jan. 30, 2013, for a hearing of the Senate Judiciary Committee hearing on gun violence. She is escorted by her husband, Mark Kelly, right, a retired astronaut, Committee Chairman Sen. Patrick J. Leahy, D-Vt., second from left, and the committee's ranking Republican, Sen. Chuck Grassley, R-Iowa, left. (AP Photo/J. Scott Applewhite)
Former Arizona Rep. Gabrielle Giffords, who was seriously injured in the mass shooting that killed six people in Tucson, Ariz. two years ago, arrives on Capitol Hill in Washington, Wednesday, Jan. 30, 2013, for a hearing of the Senate Judiciary Committee hearing on gun violence. She is escorted by her husband, Mark Kelly, right, a retired astronaut, Committee Chairman Sen. Patrick J. Leahy, D-Vt., second from left, and the committee's ranking Republican, Sen. Chuck Grassley, R-Iowa, left. (AP Photo/J. Scott Applewhite)
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