Giffords asks Senate to act on gun control

from left, Mark Kelly, husband of former Arizona Rep. Gabrielle Giffords, who was seriously injured in the mass shooting that killed six people in Tucson, Ariz. two years ago; David Kopel, law professor at Strum College in Denver; Baltimore Police Chief James Johnson, chair of the National Law Enforcement Partnership to Prevent Gun Violence; Gayle Trotter, senior fellow with the Independent Women's Forum; and National Rifle Association CEO Wayne LaPierre, are sworn in on Capitol Hill in Washington, Wednesday, Jan. 30, 2013, prior to testifying before the Senate Judiciary Committee hearing on gun violence. (AP Photo/Susan Walsh)