White House

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President Barack Obama presents a 2010 Presidential Medal of Freedom to John H. Adams, co-founder of the Natural Resources Defense Council, Tuesday, Feb. 15, 2011, during a ceremony in the East Room of the White House in Washington. (AP Photo/Carolyn Kaster)

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President Barack Obama gestures during a news conference on the White House complex in Washington, Tuesday, Feb. 15, 2011. (AP Photo/Evan Vucci)

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President Obama speaks in the East Room of the White House in Washington on Tuesday, Feb. 15, 2011, during the Medal of Freedom ceremony. (AP Photo/Charles Dharapak)

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President Obama makes a statement about his budget during a press conference at the White House in Washington, Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)

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** FILE ** Office of Management and Budget Director Jacob Lew discusses the White House budget on Monday, Feb. 14, 2011, in Washington. (Associated Press)

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President Barack Obama steps off Marine One helicopter on the South Lawn of the White House in Washington as he returns from Baltimore, Md., Monday, Feb. 14, 2011. (AP Photo/Charles Dharapak)

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President Barack Obama walks with budget director Jack Lew and Education Secretary Arne Duncan on the South Lawn of the White House in Washington as they travel to Baltimore, Md., Monday, Feb. 14, 2011. (AP Photo/Charles Dharapak)

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Office of Management and Budget Director Jack Lew discusses the White House budget on Monday, Feb. 14, 2011, in Washington. (AP Photo/Evan Vucci)

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President Obama makes a statement on the resignation of Egypt's President Hosni Mubarak in the Grand Foyer at the White House in Washington, Friday, Feb. 11, 2011. (AP Photo/Carolyn Kaster)

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President Obama meets with Egyptian President Hosni Mubarak on Wednesday, Sept. 1, 2010, in the Oval Office of the White House in Washington. (AP Photo/Susan Walsh)

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House Speaker John A. Boehner (center), accompanied by House Majority Leader Eric Cantor (right) and House Majority Whip Kevin McCarthy, leave the White House in Washington on Wednesday, Feb. 9, 2011, following a luncheon with President Obama. (AP Photo/Pablo Martinez Monsivais)

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** FILE ** Singer Barbra Streisand arrives at the White House for a state dinner in honor of Chinese President Hu Jintao on Jan. 19, 2011. (AP Photo/Evan Vucci)

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Egyptian flags wave during a Jan. 29 demonstration in front of the White House demanding that Egyptian President Hosni Mubarak step down. (Associated Press)

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President Obama meets with Egyptian President Hosni Mubarak, left, in the Oval Office of the White House in Washington on Sept. 1, 2010. U.S. intelligence agencies' failure to predict the uprisings in Tunisia and Egypt had drawn criticism from the White House and Congress. (AP Photo/Susan Walsh, File)

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President Reagan and first lady Nancy Reagan, with their dog Rex, wave to White House visitors on July 27, 1986. (Associated Press)

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House Speaker Thomas P. "Tip" O'Neill Jr. (right) leans forward to ask President Reagan a question during the Social Security bill-signing ceremony on the South Lawn of the White House on April 20, 1983, as various political figures look on. (Associated Press)