Mark Kelly

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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)

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President Obama and first lady Michelle Obama greet astronaut Mark Kelly, husband of wounded Rep. Gabrielle Giffords, at the National Prayer Breakfast in Washington on Thursday, Feb. 3, 2011. (AP Photo/Charles Dharapak)

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Astronaut Mark Kelly, husband of wounded Rep. Gabrielle Giffords, Arizona Democrat, is acknowledged by President Obama at the National Prayer Breakfast in Washington on Thursday, Feb. 3, 2011. (AP Photo/Charles Dharapak)

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Astronaut Mark Kelly travels in the ambulance that carries his wife, U.S. Rep. Gabrielle Giffords, to a Houston rehabilitation hospital. (Associated Press)

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This photo provided by ABC television shows Rep. Gabrielle Giffords' husband and NASA astronaut Capt. Mark Kelly talks with host Diane Sawyer during a pretaped interview in Tucson, Saturday, Jan. 15, 2011, his first television interview since the tragic shooting of his wife in Tucson. The interview is scheduled to air Tuesday, Jan. 18. (AP Photo/ABC News, Ralph Freso) NO ARCHIVES. NO SALES.

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Capt. Mark Kelly, husband of Rep. Gabrielle Giffords, D-Ariz., arrives at the St. Elizabeth Ann Seton Church for the funeral of 9-year-old Christina Green Thursday, Jan. 13, 2011, in Tucson, Ariz. Green was the youngest victim of Saturday's shooting in Tucson. (AP Photo/Mamta Popat, Pool)

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First lady Michelle Obama hugs astronaut Mark Kelly, husband of Rep. Gabrielle Giffords, during a memorial service for the victims of Saturday's shootings at McKale Center on the University of Arizona campus Wednesday, Jan. 12, 2011, in Tucson, Ariz. (AP Photo/Chris Carlson)

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President Obama embraces Mark Kelly, the husband of critically wounded Rep. Gabrielle Giffords, at the end of a ceremony honoring the victims of a shooting rampage that killed six people and left 14 injured last Saturday, on the University of Arizona campus, Wednesday, Jan. 12, 2011. (AP Photo/J. Scott Applewhite)

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First lady Michelle Obama watches as astronaut Mark Kelly, husband of Rep. Gabrielle Giffords, hugs Homeland Security Secretary Janet Napolitano on Wednesday in Tucson, Ariz., at a memorial service for victims of Saturday's shootings. (Associated Press)

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FILE - In this Feb. 4, 2011 file photo, astronaut Mark Kelly discusses his decision to command the final flight of the Space Shuttle Endeavor during a press conference at Johnson Space Center in Houston. Kelly's wife, Arizona Rep. Gabrielle Giffords, spoke for the first time since she was shot in the forehead, her spokesman said Wednesday Feb. 9, 2011, yet another significant milestone in her recovery from a traumatic brain injury. (AP Photo /Michael Stravato, File)