Rep. Gabrielle Giffords (D-AZ), center, is welcomed by her fellow members of the the House of Representatives as she appears on the floor for the first time since her shooting earlier this year. AP hide caption

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Taken on May 17, this photo of Rep. Gabrielle Giffords (left) and her mother, Gloria Giffords, was posted on her Facebook page on June 12. P.K. Weis/Facebook.com/GabrielleGiffords hide caption

itoggle caption P.K. Weis/Facebook.com/GabrielleGiffords

In this Jan. 5, 2011 file photo, Rep. Gabrielle Giffords, D-Ariz., takes part in a reenactment of her swearing-in, on Capitol Hill in Washington. Susan Walsh/AP hide caption

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In this Jan. 5, 2011 file photo, Rep. Gabrielle Giffords, D-Ariz., takes part in a reenactment of her swearing-in, on Capitol Hill in Washington. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP