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President Barack Obama hugs U.S. Rep. Gabrielle Giffords (Credit: Getty Images)

President Barack Obama hugs U.S. Rep. Gabrielle Giffords (D-Ariz.) as members of Congress applaud before the State of the Union address on Capitol Hill in Washington, D.C. (Jan. 24, 2012)

Rep. Gabrielle Giffords

Arizona Rep. Gabrielle Giffords was shot in the head when an assailant opened fire while the lawmaker met with constituents in Tucson on Jan. 8, 2011. Six people were killed in the shooting. She resigned from the House of Representatives on Jan. 25, 2012, to focus on her recovery.

Former U.S. Rep. Gabrielle Giffords (D-Ariz.) is escorted
(Credit: Getty Images)

Former U.S. Rep. Gabrielle Giffords (D-Ariz.) is escorted down the hall by Rep. Debbie Wasserman Schultz (D-Fla.) after she resigned from the House of Representatives on Capitol Hill in Washington, D.C. Giffords resigned from Congress to focus on her recovery from a gunshot wound to the head she received last year from a lone gunman in Arizona. (Jan. 25, 2012)

This video image, provided by House Television, shows
(Credit: AP)

This video image, provided by House Television, shows Rep. Gabrielle Giffords (D-Ariz.) on the House floor on Capitol Hill in Washington, D.C. Giffords resigned has resigned from her House seat to concentrate on her recovery from being shot outside a Tucson supermarket more than a year ago. (Jan. 25, 2012)

This video image, provided by House Television, shows
(Credit: AP)

This video image, provided by House Television, shows Rep. Gabrielle Giffords (D-Ariz.) on the floor of the House on Capitol Hill in Washington, D.C. Giffords resigned from the House amid tears, tributes and standing ovations, more than a year after she was gravely wounded during a "Congress on Your Corner" event in Tucson, Ariz. (Jan. 25, 2012)

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This video image, provided by House Television, shows
(Credit: AP)

This video image, provided by House Television, shows Rep. Gabrielle Giffords (D-Ariz.) and House Speaker John Boehner (R-Ohio), on the House floor on Capitol Hill in Washington, D.C. Giffords resigned from the House amid tears, tributes and standing ovations more than a year after she was gravely wounded by a would-be assassin. (Jan. 25, 2012)

Former U.S. Rep. Gabrielle Giffords (D-Ariz.) gets a
(Credit: Getty Images)

Former U.S. Rep. Gabrielle Giffords (D-Ariz.) gets a hug from House cloak room attendant Ella Terry after the congresswoman resigned on Capitol Hill in Washington, D.C. (Jan. 25, 2012)

Members of Congress applaud as Rep. Gabrielle Giffords
(Credit: Getty Images)

Members of Congress applaud as Rep. Gabrielle Giffords (D-Ariz.) arrives for the State of the Union address on Capitol Hill in Washington, D.C. (Jan. 24, 2012)

President Barack Obama greets retiring Rep. Gabrielle Giffords
(Credit: AP)

President Barack Obama greets retiring Rep. Gabrielle Giffords (D-Ariz.) on Capitol Hill in Washington, D.C., before delivering his State of the Union address. (Jan. 24, 2012)

President Barack Obama hugs U.S. Rep. Gabrielle Giffords
(Credit: Getty Images)

President Barack Obama hugs U.S. Rep. Gabrielle Giffords (D-Ariz.) as members of Congress applaud before the State of the Union address on Capitol Hill in Washington, D.C. (Jan. 24, 2012)

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U.S. Rep. Gabrielle Giffords (D-Ariz.) tours the Gabrielle
(Credit: AP)

U.S. Rep. Gabrielle Giffords (D-Ariz.) tours the Gabrielle Giffords Family Assistance Center in Tucson, Ariz., with Community Food Bank chief executive Bill Carnegie. The tour was her last act as a congresswoman before her resignation. (Jan. 23, 2012)

U.S. Rep. Gabrielle Giffords, D-Ariz., and her husband,
(Credit: AP)

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, in Tucson, Ariz. (Nov. 24, 2011)

U.S. Rep. Gabrielle Giffords, D-Ariz., and her husband,
(Credit: AP )

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, in Tucson, Ariz. (Nov. 24, 2011)

U.S. Rep. Gabrielle Giffords, D-Ariz., waves to airmen
(Credit: AP )

U.S. Rep. Gabrielle Giffords, D-Ariz., waves to airmen while serving a Thanksgiving meal at Davis-Monthan Air Force Base, Thursday, in Tucson, Ariz. (Nov. 24. 2011)

Diane Sawyer interviews Rep. Gabrielle Giffords and her
(Credit: ABC/Ida Mae Astute)

Diane Sawyer interviews Rep. Gabrielle Giffords and her husband Mark Kelly.

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Diane Sawyer interviews Rep. Gabrielle Giffords and her
(Credit: ABC / Ida Mae Astute)

Diane Sawyer interviews Rep. Gabrielle Giffords and her husband Mark Kelly.

Diane Sawyer interviews Rep. Gabrielle Giffords and her
(Credit: ABC/IDA MAE ASTUTE)

Diane Sawyer interviews Rep. Gabrielle Giffords and her husband Mark Kelly by her side.

In this image released by the White House,
(Credit: AP)

In this image released by the White House, Navy Capt. Mark Kelly hugs his wife Rep. Gabrielle Giffords (D-Ariz.), after he received the Legion of Merit from Vice President Joe Biden during Kelly's retirement ceremony. (Oct. 6, 2011)

Photo of Rep. Gabrielle Giffords that was posted
(Credit: AP )

Photo of Rep. Gabrielle Giffords that was posted to her public Facebook page by her aides in June. The photo was taken in May at TIRR Memorial Hermann Hospital in Houston. (May 17, 2011)

This, most recent photo of Rep. Gabrielle Giffords
(Credit: AP )

This, most recent photo of Rep. Gabrielle Giffords since she was shot, was posted to her public Facebook page by her aides Sunday morning June 12, 2011. The photo was taken in May at TIRR Memorial Hermann Hospital. (May 17, 2011)

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Rep. Gabrielle Giffords was shot in the head
(Credit: Getty Images)

Rep. Gabrielle Giffords was shot in the head by a gunman who opened fire in Tucson, Arizona, killing six people on Jan. 8, 2011.

This undated photo, courtesy of the Giffords For
(Credit: AFP/Getty Images)

This undated photo, courtesy of the Giffords For Congress website, shows Rep. Gabrielle Giffords speaking with a rancher.

Christina Green, 9, was killed at a political
(Credit: AP)

Christina Green, 9, was killed at a political event with Rep. Gabrielle Giffords in Tucson, Ariz. on Saturday, Jan. 8, 2011.

Suzi Hileman hugs a teddy bear while talking
(Credit: AP)

Suzi Hileman hugs a teddy bear while talking about Christina-Taylor Green at Hileman's home in Tucson, Ariz. About Christina, her neighbor who died in the shooting, Hileman says, "She was my friend. I lost a friend." (Jan. 20, 2011)

Suzi Hileman talks about Christina-Taylor Green at Hileman's
(Credit: AP)

Suzi Hileman talks about Christina-Taylor Green at Hileman's home in Tucson, Ariz. "I took my girlfriend's daughter to the grocery store, and it was my job to bring her back," the Oceanside native told Newsday in a phone interview. (Jan. 20, 2011)

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Bill Hileman hugs his wife, Suzi Hileman, who
(Credit: AP)

Bill Hileman hugs his wife, Suzi Hileman, who cries while talking about Christina-Taylor Green at their home in Tucson, Ariz., Thursday. Suzi Hileman was the family friend of Christina, 9, and brought the child to the event where the shooting massacre occurred. (Jan. 20, 2011)

A young girl places a rock at the

A young girl places a rock at the makeshift memorial outside of the District Office of U.S. Rep. Gabrielle Giffords in Tucson, Arizona. (Jan. 9, 2011)

Shooting suspect Jared Loughner, 22, lived in this
(Credit: Getty Images)

Shooting suspect Jared Loughner, 22, lived in this modest home in Tucson, Arizona with his parents. (Jan. 10, 2011)

This mug shot released by the Pima County
(Credit: AP)

This mug shot released by the Pima County Sheriff's Office shows shooting suspect Jared Loughner. Loughner is accused of fatally shooting six people and critically wounding a congresswoman at a Tucson, Ariz. political event on Jan. 8, 2011.

President Barack Obama and first lady Michelle Obama
(Credit: Getty Images)

President Barack Obama and first lady Michelle Obama observe a moment of silence at the White House to honor the victims of a shooting at an Arizona political event that left people six dead. (Jan. 10, 2011)

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Members of Congress and staff observe a moment
(Credit: AP)

Members of Congress and staff observe a moment of silence Monday for Rep. Gabrielle Giffords and other shooting victims on Capitol Hill in Washington, D.C. (Jan. 10, 2011)

Members of Congress and staff members gather to
(Credit: AP)

Members of Congress and staff members gather to observe a moment of silence for Rep. Gabrielle Giffords (D-Ariz.) and other shooting victims on the East Steps of the Capitol. (Jan. 10, 2011)

This undated handout image courtesy of Giffords For
(Credit: AFP/Getty Images)

This undated handout image courtesy of Giffords For Congress website shows Rep. Gabrielle Giffords reading to children. Giffords was in critical condition January 9, 2011 after being shot in the head Saturday by a gunman who opened fire in Tucson, Ariz., killing six people including a federal judge. Giffords was hosting a "Congress on Your Corner" event with constituents at when the gunman attacked, killing six and wounding 12, according to police spokesman Rick Kastigar.

An undated photo of U.S. Rep. Gabrielle Giffords
(Credit: Getty Images)

An undated photo of U.S. Rep. Gabrielle Giffords who was shot Jan. 8, 2011, while meeting with constituents outside a supermarket in Tucson, Ariz.

Dr. G. Michael Lemole, Jr., left, looks on
(Credit: AP)

Dr. G. Michael Lemole, Jr., left, looks on as Dr. Peter Rhee talks about the condition of U.S. Rep. Gabrielle Giffords (D-Ariz.), at University Medical Center during a news conference in Tucson, Ariz. (Jan. 10, 2011)

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American flags fly at half staff on the
(Credit: Getty Images)

American flags fly at half staff on the National Mall in front of the U.S. Capitol in memory of the victims of Saturday's mass shooting in Tucson, Ariz. (Jan. 10, 2011)

Flowers and candles are seen placed outside the
(Credit: AP)

Flowers and candles are seen placed outside the office of Rep. Gabrielle Giffords after Giffords was shot in the head by a gunman who opened fire outside a grocery store, Saturday, Jan. 8, 2011, in Tucson, Ariz. (Jan. 10, 2011)

Map of the site of the shooting in
(Credit: AP)

Map of the site of the shooting in Tucson, Ariz., where Rep. Gabrielle Giffords (D-Ariz.) was shot and six others were killed.

The six fatal shooting victims from the Tucson,
(Credit: AP)

The six fatal shooting victims from the Tucson, Ariz., attack on Jan. 8, 2011 are shown. From top left: Christina Taylor Green, 9, Dorothy Morris, 76, Arizona Federal District Judge John Roll, 63. From bottom left, Phyllis Schneck, 79, Dorwin Stoddard, 76, and Gabe Zimmerman, 30.

Rep. Gabrielle Giffords's aide Gabe Zimmerman, 30, was
(Credit: AP)

Rep. Gabrielle Giffords's aide Gabe Zimmerman, 30, was killed Saturday, Jan. 8, 2011 when a gunman opened fire at a political event in Tucson, Ariz.

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Shooting suspect Jared L. Loughner attends the 2010
(Credit: AP / Arizona Daily Star, Mamta Popat)

Shooting suspect Jared L. Loughner attends the 2010 Tucson Festival of Books in Tucson, Ariz. (March 2010)

This March 2010 photo shows a man identified
(Credit: AP / Arizona Daily Star)

This March 2010 photo shows a man identified as Jared L. Loughner at the 2010 Tucson Festival of Books in Tucson, Ariz.

A man believed to be suspected gunman Jared
(Credit: Reuters)

A man believed to be suspected gunman Jared Lee Loughner is pictured in this photograph obtained from Loughner's MySpace page. (Jan. 8, 2011)

Shooting suspect Jared L. Loughner shown in this
(Credit: AP)

Shooting suspect Jared L. Loughner shown in this photo obtained from the 2006 Mountain View High School yearbook.

Sheriff's deputies guard an entrance into the crime
(Credit: Getty Images)

Sheriff's deputies guard an entrance into the crime scene outside Safeway, the day after a gunman opened fire on a group of people on Jan. 8, 2011 in Tucson, Arizona. (Jan. 9, 2011)

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A flag flies at half-staff above the White
(Credit: Getty Images)

A flag flies at half-staff above the White House. President Barack Obama ordered flags to be flown at half-staff in honour of the victims of the shooting in Tucson, Arizona. (Jan. 9, 2011)

Vera Rapcsak, 20, of Tucson, Arizona holds a

Vera Rapcsak, 20, of Tucson, Arizona holds a peace sign outside the office of U.S. Rep. Gabrielle Giffords (D-AZ), who was shot in front of a Safeway grocery store Jan. 8, 2011 in Tuscon, Arizona. (Jan. 9, 2011)

Lily Wool, left, 19, of Tucson, Arizona and
(Credit: Getty Images)

Lily Wool, left, 19, of Tucson, Arizona and Vera Rapcsak, 20, of Tucson, hold peace signs outside the office of U.S. Rep. Gabrielle Giffords (D-AZ), who was shot in front of a Safeway grocery store Jan. 8, 2011 in Tuscon, Arizona. (Jan. 9, 2011)

Six balloons fly at a prayer service, representing
(Credit: Getty Images)

Six balloons fly at a prayer service, representing the six people killed in Saturday's shooting spree in Tuscon, Arizona. (Jan. 9, 2010)

The American flag flies at half-mast on the
(Credit: AP )

The American flag flies at half-mast on the U.S. Capitol in Washington, Sunday, to honor a slain aide for Rep. Gabrielle Giffords, Gabe Zimmerman. (Jan. 9, 2011)

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Police block off the shopping center where U.S.
(Credit: Getty Images)

Police block off the shopping center where U.S. Rep. Gabrielle Giffords and several others were shot during an event in front of a Safeway grocery store in Tuscon, Arizona. (Jan. 8, 2011)

Police search the parking lot outside a Safeway
(Credit: AP)

Police search the parking lot outside a Safeway where there has been a shooting involving Rep. Gabrielle Giffords (D-Ariz.) in Tucson, Ariz. (Jan. 8, 2011)

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