Barack Obama

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** FILE ** President Obama greets Daniel Hernandez, an intern for Rep. Gabrielle Giffords, who helped her after she was shot, at a memorial service on the University of Arizona campus in Tucson, Ariz., on Wednesday, Jan. 12, 2011. (AP Photo/J. Scott Applewhite)

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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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President Obama speaks at 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/J. Scott Applewhite)

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Fay Dubord, of Tucson, Ariz., listens to remarks by President Obama at a memorial service for the victims of Saturday's shootings at Arizona Stadium in Tucson, Ariz., on Wednesday, Jan. 12, 2011. (AP Photo/Charlie Riedel)

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Al Afjei and his wife Somayeh Ghorbani, of Tucson, Ariz., listen with an overflow crowd at Arizona Stadium to remarks by President Obama at a memorial service for the victims of Saturday's shootings, Wednesday, Jan. 12, 2011, on the University of Arizona campus in Tucson. (AP Photo/Charlie Riedel)

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HONORED: President Obama joins the audience Wednesday during a memorial service in Tucson, Ariz., in applauding Daniel Hernandez, an intern for Democratic Rep. Gabrielle Giffords who helped her immediately after she was wounded Saturday during the shopping center shooting spree. (Associated Press)

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President Obama hugs Daniel Hernandez, an intern for Rep. Gabrielle Giffords, at a memorial service Wednesday for the victims of Saturday's shootings at McKale Center on the University of Arizona campus in Tucson, Ariz. (Associated Press)

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President Obama meets with Lebanese Prime Minister Saad Hariri on Wednesday, Jan. 12, 2011, in the Oval Office of the White House in Washington. (AP Photo/Charles Dharapak)

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President Obama speaks in the Oval Office of the White House on Monday. (Associated Press)

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President Obama confers Monday with visiting French President Nicolas Sarkozy. "There's still too many imbalances in the world economy that are inhibiting the prospects of growth," Mr. Sarkozy said. (Associated Press)

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President Obama meets with French President Nicolas Sarkozy in the Oval Office of the White House, Monday, Jan. 10, 2011. As France assumes the presidency of the G-8 and the G-20 for 2011, Mr. Obama and Mr. Sarkozy will discuss a broad range of current financial, foreign policy and security issues. (AP Photo/J. Scott Applewhite)

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President Barack Obama and first lady Michelle Obama are joined by government employees on the South Lawn of the White House in Washington, Monday, Jan. 10, 2011, to observe a moment of silence for Rep. Gabrielle Giffords, D-Ariz., and the other victims of an assassination attempt against her. (AP Photo/J. Scott Applewhite)

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** FILE ** French President Nicolas Sarkozy (left) listens as President Obama speaks in the East Room of the White House in Washington in March 2010. Mr. Sarkozy meets with Mr. Obama on Monday to discuss the international financial system, among other matters. (AP Photo/Susan Walsh, File)

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MOURNING: Flags in Washington were lowered to half-staff by order of President Obama to remember the victims of the rampage. (Associated Press)

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President Obama applauds as William Daley, a former commerce secretary and his new White House chief of staff, delivers a statement in the East Room of the White House on Thursday. (Associated Press)

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White House press secretary Robert Gibbs, who joined President Obama's staff when Mr. Obama was running for the U.S. Senate, announces Wednesday that he will join other high-ranking staffers leaving the presidential staff. (Associated Press)

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President Obama returns a salute as he and daughter Sasha arrive with his wife, Michelle, and other daughter Malia at Andrews Air Force Base in Maryland on Tuesday after nearly two weeks of vacation in Hawaii. (Associated Press)

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President Obama got an assist from then-Republican Sen. Arlen Specter of Pennsylvania in Febraury 2009 when he provided a key vote for the economic stimulus package. As Mr. Specter leaves the Senate after 30 years, he says he wouldn't change a thing about his political path, which included switching political parties. (Associated Press)

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President Obama picks up a "tar ball" from the beach in Port Fourchon, La., in May after the largest oil spill in U.S. history in the Gulf of Mexico. (Associated Press)

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President Barack Obama, followed by, from second from left, Gen. David Petraeus, Defense Secretary Robert Gates, Vice President Joe Biden, and Joint Chiefs Chairman Adm. Michael Mullen, walks to the Rose Garden of the White House in Washington, Wednesday, June 23, 2010, to announce that Petraeus would replace Gen. Stanley McChrystal. (AP Photo/Charles Dharapak)