Photo by AP/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, center, arrives, on Capitol Hill in Washington on Wednesday, Jan. 30, 2013, to speak before the Senate Judiciary Committee hearing on what lawmakers should do to curb gun violence in the wake of last month's shooting rampage at that killed 20 schoolchildren in Newtown, Conn. From left are, the committee's ranking Republican, Sen. Charles Grassley, R-Iowa, Committee Chairman Sen. Patrick J. Leahy, D-Vt., and her husband Mark Kelly, a retired astronaut, Giffords, right.