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

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May 28, 2008, file photo: Space shuttle Discovery commander Mark Kelly, right, gestures as he walks with his twin brother astronaut Scott Kelly, left, and mission specialist Ron Garan, after arrival at Kennedy Space Center in Cape Canaveral, Fla. Terry Renna/AP hide caption

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Mark Kelly, husband of Rep. Gabrielle Giffords (D-AZ), as he spoke to reporters at the University Medical Center in Tucson, Ariz., earlier today (Jan. 20, 2011). John Moore/Getty Images hide caption

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Mark Kelly, speaking about his wife; Jan. 20, 2011

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A makeshift memorial outside the University Medical Center in Tucson includes candles and this photo of Rep. Gabrielle Giffords with supporters. John Moore/Getty Images hide caption

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Mark Kelly, husband of Rep. Gabrielle Giffords (D-AZ) on ABC-TV's 20/20. abcnews.go.com hide caption

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