Gabrielle Giffords

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Rep. Gabrielle Giffords, with husband Mark Kelly, gives her first public interview in November since she was shot in the head in Tucson, Ariz., last January. (ABC via Associated Press)

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"Gabby: A Story of Courage and Hope" is Mark Kelly's telling of the long road to recovery by his wife, Rep. Gabrielle Giffords. (southwestphotobank.com via Associated Press)

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This image provided by Scibner shows the cover of "Gabby: A Story of Courage and Hope," the joint memoir of Rep. Gabrielle Giffords and her husband, retired astronaut Mark Kelly. (Associated Press)

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**FILE** Rep. Gabrielle Giffords, here taking a break from rehabilitation to participate in the House debt-ceiling vote on Aug. 1, has not said whether she will run for re-election in 2012. (Associated Press)

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Rep. Gabrielle Giffords (center), Arizona Democrat, appears on the floor of the House of Representatives on Monday. Ms. Giffords was on the floor for the first time since her shooting earlier this year, attending a vote on the debt-standoff compromise. (Associated Press)

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In this image from House Television, Rep. Gabrielle Giffords, Arizona Democrat, appears on the floor of the House of Representatives Monday, Aug. 1, 2011, in Washington. Giffords was on the floor for the first time since her shooting earlier this year, attending a vote on the debt standoff compromise. (AP Photo/House Television)

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Ron Barber, director for Rep. Gabrielle Giffords' district office, hugs a co-worker on his first day back to work Tuesday in Tucson, Ariz. Mr. Barber was shot in the cheek and thigh during the rampage, which killed six people and injured 13. (Associated Press)

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NASA Administrator Charles Bolden (left), accompanied by astronaut Capt. Mark Kelly, husband of wounded Arizona Rep. Gabrielle Giffords, speaks at the National Press Club in Washington on July 1, 2011. (Associated Press)

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**FILE** In this undated photo, Rep. Gabrielle Giffords (left), Arizona Democrat, is shown with her husband, NASA astronaut Mark Kelly. (Associated Press/Office of Rep. Gabrielle Giffords)

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Rep. Gabrielle Giffords has plenty of time to decide and could win the Senate race even if she waited until 2012 before entering, the former chairman of the Arizona Democratic Party says. (southwestphotobank.com via Associated Press)

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** FILE ** A photo of Rep. Gabrielle Giffords posted to her public Facebook page by her aides on June 12, 2011. The photos were taken May 17, 2011, at TIRR Memorial Hermann Hospital, the day before she had her cranioplasty. (Associated Press/Giffords Campaign)

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The most recent photos taken of Rep. Gabrielle Giffords (left) since she was shot were posted to her public Facebook page by her aides on June 12, 2011. The woman in the background is her mother Gloria Giffords. The photos were taken May 17, 2011, at TIRR Memorial Hermann Hospital, the day before she had her cranioplasty. (Associated Press/Giffords Campaign)

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Rep. Gabrielle Giffords, Arizona Democrat

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Capt. Mark E. Kelly, husband of wounded Rep. Gabrielle Giffords, will be aboard Endeavour for its final flight in April, NASA confirmed Friday Jan. 4, 2011. (AP Photo/NASA, File)

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President Obama and first lady Michelle Obama greet astronaut Mark Kelly, husband of wounded Democratic Rep. Gabrielle Giffords, at the National Prayer Breakfast in Washington. Failures while in the White House have prompted him to question God's plans for him, the president said. (Associated Press)

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President Obama and first lady Michelle Obama greet astronaut Mark Kelly, husband of wounded Democratic Rep. Gabrielle Giffords, at the National Prayer Breakfast in Washington on Thursday. Failures while in the White House have prompted him to question God's plans for him, the president said. (Associated Press)