Gabrielle Giffords

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Ron Barber, seen here in January with then-Rep Gabrielle Giffords, Arizona Democrat, hopes to keep the seat that his former boss relinquished in the Democratic column in a special election on Tuesday. It is one of three House seats currently vacant. (Associated Press)

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From left; Former Missouri Rep. Ike Skelton, Navy Secretary Ray Mabus, former Arizona Rep. Gabrielle Giffords, D-Ariz., her husband Mark Kelly, and Roxanna Green, obscured, the mother of the nine-year-old Christina-Taylor Green who was killed while attending the meeting of constituents when Giffords was shot, attend a ceremony at the Pentagon, Friday, Feb. 10, 2012, to unveil the USS Gabrielle Giffords. The Navy has named a ship for Gabrielle Giffords, the recently retired congresswoman from Arizona who is recovering from a gunshot wound to the head received in January 2011. (AP Photo Manuel Balce Ceneta)

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President Obama, accompanied by Vice President Joe Biden, former Arizona Rep. Gabrielle Giffords and her husband Mark Kelly, signs Feb. 10, 2012, the Ultralight Aircraft Smuggling Prevention Act of 2012 in the Oval Office of the White House. The bill, which gives law enforcement greater authority to combat illicit drug trafficking on U.S. borders, is the last piece of legislation that Giffords sponsored and voted on. (Associated Press)

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Rep Gabrielle Giffords, Arizona Democrat, tours the Gabrielle Giffords Family Assistance Center, one of her favorite charities, with staffer Ron Barber in Tucson, Ariz., last month. Mr. Barber, a top aide to Ms. Giffords, announced his candidacy to run in a special election to serve as a replacement for the Arizona Democrat who was wounded in a shooting rampage. (Associated Press)

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Rep. Gabrielle Giffords (center), Arizona Democrat, is greeted by Rep. Jeff Flake, Arizona Republican, and Rep. Debbie Wasserman Schultz, Florida Democrat, before President Obama's State of the Union address to Congress on Tuesday, Jan. 24, 2012, on Capitol Hill in Washington. (AP Photo/Saul Loeb, Pool)

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President Obama embraces retiring Rep. Gabrielle Giffords, Arizona Democrat, as members of Congress applaud before his State of the Union address on Tuesday, Jan. 24, 2012, on Capitol Hill in Washington. (AP Photo/Saul Loeb)

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Rep. Gabrielle Giffords, a moderate Democrat, takes her place between Rep. Jeff Flake, a conservative Republican, and Rep. Raul M. Grijalva, a liberal Democrat. Colleagues started a tribute last year by sitting with members of the other party. (Associated Press)

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President Barack Obama embraces retiring Rep. Gabrielle Giffords, D-Ariz., as members of Congress applaud before his State of the Union address in front of a joint session of Congress Tuesday, Jan. 24, 2012, on Capitol Hill in Washington. (AP Photo/Saul Loeb)

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Rep. Gabrielle Giffords, Arizona Democrat, tours the Gabrielle Giffords Family Assistance Center in Tucson, Ariz., on Monday with staffer Ron Barber. It was one of her last acts as a congresswoman before stepping down this week to focus on her recovery from a gunshot to the head last year. (Associated Press)

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A video image provided by the office of Rep. Gabrielle Giffords shows Mrs. Giffords announcing her plans to resign on Sunday, Jan. 22, 2012. (AP Photo/Office of Rep. Gabrielle Giffords)

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** FILE ** This video image provided by the Office of Rep. Gabrielle Giffords shows Giffords announcing her plans to resign, Sunday, Jan. 22, 2012. (AP Photo/Office of Gabrielle Giffords)

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Rep. Gabrielle Giffords and her husband, retired Navy Capt. Mark Kelly, walk on the Davidson Canyon Gabe Zimmerman Memorial Trailhead on Saturday, Jan. 7, 2012, to pay tribute to Zimmerman, who was killed a year ago during the Tucson shooting. Zimmerman was the director of community outreach for Mrs. Giffords. (AP Photo/The Arizona Republic, Cheryl Evans)

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Rep. Gabrielle Giffords and husband Mark Kelly pose at the Davidson Canyon Gabe Zimmerman Memorial trailhead outside Tucson, Ariz., on Saturday, Jan. 7, 2012. The trailhead is named in honor of Mrs. Giffords' slain staff member Gabe Zimmerman. (AP Photo/Office of Rep. Gabrielle Giffords)

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Ron Barber plans to attend every event he can to remember the tragic day nearly a year ago when a gunman opened fire as Rep. Gabrielle Giffords was meeting with constituents. The congresswoman was shot in the head, and six people were killed. (Associated Press)

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PREMIUM CONTENT--HIGHER RATES APPLY FOR NON-PHOTOSTREAM MEMBERS - U.S. Rep. Gabrielle Giffords, D-Ariz., and her husband, retired Capt. Mark Kelly, serve a Thanksgiving meal to troops at Davis-Monthan Air Force Base, Thursday, Nov. 24, 2011, in Tucson, Ariz. (AP Photo/Matt York)

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PREMIUM CONTENT--HIGHER RATES APPLY FOR NON-PHOTOSTREAM MEMBERS - U.S. Rep Gabrielle Giffords, D-Ariz., and her husband, retired Capt. Mark Kelly, meet both active and retired airmen after serving a Thanksgiving meal to troops at Davis-Monthan Air Force Base, Thursday, Nov. 24, 2011, in Tucson, Ariz. (AP Photo/Matt York)

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U.S. Rep. Gabrielle Giffords, Arizona Democrat, and her husband, retired Capt. Mark Kelly, serve a Thanksgiving meal to troops at Davis-Monthan Air Force Base, Thursday, Nov. 24, 2011, in Tucson, Ariz. (AP Photo/Matt York)

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Rep. Gabrielle Giffords and husband Mark Kelly are interviewed by Diane Sawyer on ABC's 20/20. The show, featuring the first public interview Giffords has given since she was shot in the head in Tucson last winter, aired Nov. 14, 2011. (Associated Press/ABC)