Barack Obama

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President Obama (left) reacts after he was presented with a hurley stick from Irish Prime Minister and Taoiseach Enda Kenny while in Farmleigh, Dublin, on May 23, 2011. (Associated Press)

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President Obama and AIPAC President Lee Rosenberg greet the crowd gathered at the American Israel Public Affairs Committee convention in Washington on Sunday. (Associated Press)

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MOVERS AND SHAKERS: President Obama greets Michael Kassen, a member of the AIPAC National Board of Directors. Mr. Kassen began his term as president-elect during the conference. (Associated Press)

President Barack Obama's image is displayed as he tells delegates at the American Israel Public Affairs Committee (AIPAC) convention that the bonds between the US and Israel are "unbreakable", Washington, Sunday, May 22, 2011. (AP Photo/J. Scott Applewhite)

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President Obama speaks at the American Israel Public Affairs Committee (AIPAC) convention in Washington on Sunday, May 22, 2011. Mr. Obama said the bonds between the United States and Israel are unbreakable. (AP Photo/Jose Luis Magana)

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President Obama meets with Israeli Prime Minister Benjamin Netanyahu in the Oval Office at the White House in Washington on Friday, May 20, 2011. (AP Photo/Charles Dharapak)

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** FILE ** In this April 2, 2009, file photo U.S. President Barack Obama speaks at the G20 Summit closing press conference in London. Obama departs Sunday, May 22, 2011, for his eighth trip to Europe as president. (AP Photo/Kirsty Wigglesworth, File)

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** FILE ** President Barack Obama speaks to CIA employees at the CIA Headquarters, Friday, May 20, 2011, in Langley, Va. (AP Photo/Carolyn Kaster)

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President Obama meets with Prime Minister Benjamin Netanyahu of Israel on May 20, 2011, in the Oval Office at the White House. (Associated Press)

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President Obama delivers a speech on the Middle East at the State Department in Washington on Thursday, May 19, 2011. Secretary of State Hillary Rodham Clinton is seated at right, and Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, is seen at left. (Associated Press)

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A veiled Palestinian woman walks near a television during a speech by President Obama in the West Bank city of Nablus on Thursday. Mr. Obama endorsed a key Palestinian demand for the borders of a future state and prodded Israel to accept that it can never have a truly peaceful nation that is based on "permanent occupation." (Associated Press)

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SENDING A MESSAGE: "We have the chance to show that America values the dignity of the street vendor in Tunisia," President Obama said. (Associated Press)

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President Obama delivers a policy address on events in the Middle East at the State Department in Washington on Thursday, May 19, 2011. (AP Photo/Charles Dharapak)

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Joint Chiefs Vice Chairman Gen. James E. Cartwright reportedly is President Obama's pick as next chairman, but the current chairman is said to oppose him. (Associated Press)

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President Obama congratulates Ensign Patrick George Bennett III, grandson of Rear Adm. Stephen Rochon (second from right), chief White House usher, as Janet Napolitano, secretary of homeland security, looks on at the U.S. Coast Guard Academy graduation in New London, Conn., on Wednesday, May 18, 2011. (AP Photo/Charles Dharapak)