This video image provided by House Television shows Rep. Gabrielle Giffords, Arizona Democrat, on the floor of the House on Capitol Hill on Jan. 25, 2012. Giffords resigned from the House amid tears, tributes and standing ovations, more than a year after she was gravely wounded by a would-be assassin. (Associated Press/House Television)

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This video image provided by House Television shows Rep. Gabrielle Giffords, Arizona Democrat, on the floor of the House on Capitol Hill on Jan. 25, 2012. Giffords resigned from the House amid tears, tributes and standing ovations, more than a year after she was gravely wounded by a would-be assassin. (Associated Press/House Television)