** FILE ** Former Rep. Gabrielle Giffords, who was seriously injured in a mass shooting that killed six people in Tucson, Ariz., in 2011, sits with her husband, Mark Kelly, a retired astronaut, on Capitol Hill in Washington on Wednesday, Jan. 30, 2013, before speaking before the Senate Judiciary Committee hearing on what lawmakers should do to curb gun violence in the wake of the December shooting rampage that killed 20 schoolchildren in Newtown, Conn. (AP Photo/J. Scott Applewhite)

Photo by: J. Scott Applewhite

** FILE ** Former Rep. Gabrielle Giffords, who was seriously injured in a mass shooting that killed six people in Tucson, Ariz., in 2011, sits with her husband, Mark Kelly, a retired astronaut, on Capitol Hill in Washington on Wednesday, Jan. 30, 2013, before speaking before the Senate Judiciary Committee hearing on what lawmakers should do to curb gun violence in the wake of the December shooting rampage that killed 20 schoolchildren in Newtown, Conn. (AP Photo/J. Scott Applewhite)