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WASHINGTON, DC - May 11: The seat for Rep. Gabrielle Giffords, D-Ariz., is empty during the House Armed Services markup of the fiscal 2012 defense authorization bill. In January, Giffords was shot through the head by a gunman who ambushed a constituent meeting in a Tuscon shopping mall parking lot. She is undergoing treatment in Houston, and has not returned to Capitol Hill since the shooting. (Photo by Scott J. Ferrell/Congressional Quarterly)

WASHINGTON, DC - May 11: The seat for Rep. Gabrielle Giffords, D-Ariz., is empty during the House Armed Services markup of the fiscal 2012 defense authorization bill. In January, Giffords was shot through the head by a gunman who ambushed a constituent meeting in a Tuscon shopping mall parking lot. She is undergoing treatment in Houston, and has not returned to Capitol Hill since the shooting. (Photo by Scott J. Ferrell/Congressional Quarterly)

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