Politics

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** FILE ** Sudanese armed forces ride a military vehicle in the oil-rich border town of Heglig, Sudan, on Tuesday, April 24, 2012. (AP Photo/Abd Raouf)

** FILE ** - Andrew Young, a former aide to former Sen. John Edwards, North Carolina Democrat, and his wife, Cheri Young, appear during a hearing at the Chatham County Superior Court in Pittsboro, N.C., on Monday, March 12, 2010. (AP Photo/Sara D. Davis)

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Israeli Prime Minister Benjamin Netanyahu (center) arrives for the weekly Cabinet meeting in Jerusalem on Sunday, April 29, 2012. (AP Photo/Ronen Zvulun, Pool)

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** FILE ** Then-Yemeni President Ali Abdullah Saleh speaks to state media reporters at the Presidential Palace in Sanaa, Yemen, on Sunday, Jan. 22, 2012. (AP Photo/Office of the Yemeni Presidency)

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Norwegian Maj. Gen. Robert Mood, head of the U.N. observer team in Syria, is seen next to a portrait of Syrian President Bashar Assad in Damascus, Syria, on Sunday, April 29, 2012. (AP Photo/Bassem Tellawi)

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Pakistani police officers cover a vehicle to hide the family of Osama bin Laden from the media in Islamabad on Thursday, April 26, 2012. (AP Photo/M. Yasir)

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President Obama high-fives late-night comedian Jimmy Kimmel as Caren Bohan, a Reuters journalist and president of the White House Correspondents' Association, watches during the group's annual dinner on Saturday, April 28, 2012, in Washington. (AP Photo/Haraz N. Ghanbari) ** FILE **

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Uggie, the canine star of the film "The Artist," walks the red carpet with Diane Sawyer at the White House Correspondents' Association dinner on Saturday, April 28, 2012, in Washington. Uggie was a guest of The Washington Times. (AP Photo/Kevin Wolf)

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President Obama speaks at the White House Correspondents' Association dinner on Saturday, April 28, 2012, in Washington. (AP Photo/Haraz N. Ghanbari)

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GOP candidate Delegate robert G. Marshall, second from right, talks during the first of three debates, Saturday, April 28, 2012, in Roanoake, Va. Other GOP candidates participating in the debate is from left, former Virginia Sen. George Allen, Chesapeake minister E.W. Jackson, and tea party leader Jamie Radtke. The winner of the primary will face former Gov. Tim Kaine in November. (AP Photo/The Roanoke Times, Stephanie Klein-Davis)

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FILE - In this April 27, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney waves after speaking at Otterbein University in Westerville, Ohio. “I'm absolutely convinced that this nation is the greatest nation on earth, and it is so because of the American people, a people who stand united when called upon by leaders to be united,” Romney said, offering unusually measured remarks, even for the former businessman's standards, mentioning Obama by name only a handful of times. “I will try and unite the American people, not divide us.” (AP Photo/Jae C. Hong, File)

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** FILE ** In this April 4, 2012, file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum sits at Bob's Diner in Carnegie, Pa. (AP Photo/Jae C. Hong, File)