White House

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Former President George W. Bush and former first lady Laura Bush, right, unveil their portraits in the East Room of the White House in Washington, Thursday, May 31, 2012. (AP Photo/Carolyn Kaster)

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President Barack Obama and former President George W. Bush arrive in the East Room of the White House in Washington, Thursday, May 31, 2012, for Bush's portrait unveiling. (AP Photo/Charles Dharapak)

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President Bill Clinton and first lady Hillary Rodham Clinton applaud as former President George H.W. Bush and former first lady Barbara Bush stand near the presidential portrait of Mr. Bush at its unveiling at the White House in 1995. A portrait of Mrs. Bush was unveiled as well. (Associated Press)

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White House Press Secretary Jay Carney

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President Obama signs the reauthorization of the Export-Import Bank Act of 2012 on Wednesday, May 30, 2012, in the Eisenhower Executive Office Building on the White House campus in Washington. (AP Photo/Pablo Martinez Monsivais)

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President Obama awards the Medal of Freedom to former Polish Foreign Minister Adam Daniel Rotfeld who is accepting for Jan Karski, a resistance fighter against the Nazi occupation of Poland during World War II, during a ceremony in the East Room of the White House in Washington, Tuesday, May 29, 2012. (AP Photo/Charles Dharapak)

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President Obama stands May 29, 2012, with rock legend Bob Dylan at the White House, where the president presented Dylan with a Medal of Freedom. (Associated Press)

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Corn soup with summer vegetables, a recipe by White House chef Sam Kass, is part of first lady Michelle Obama's book, "American Grown: The Story of the White House Kitchen Garden and Gardens Across America." (Crown Publishing via Associated Press)

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President George W. Bush greets Artie Muller, national executive director of Rolling Thunder, and singer Nancy Sinatra at the White House in May 2004. Mr. Muller and Miss Sinatra will again be part of the Memorial Day Rolling Thunder tribute to veterans. (Associated Press)