White House

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White House pastry chef Bill Yosses exchanges his white apron for a bow tie Saturday, Feb. 19, 2011, to tell scientists in Washington how chefs are changing perceptions of tastes during an American Association for the Advancement of Science presentation on the science of taste. (AP Photo/Jacquelyn Martin)

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President Barack Obama speaks in the East Room of the White House, Wednesday, Feb. 16, 2011, in Washington, about America's Great Outdoors initiative. (AP Photo/Carolyn Kaster)

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President Obama speaks on the America's Great Outdoors initiative Wednesday during a ceremony in the East Room of the White House. (Associated Press)

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President Obama presents the Medal of Freedom, the nation's highest civilian honor, to former President George H.W. Bush Tuesday at the White House. Mr. Obama said Mr. Bush's "humility and his decency reflects the very best of the American spirit." (Associated Press)

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President Obama stands with Elizabeth Little, whose husband Dr. Tom Little, an optometrist killed in Afghanistan, was posthumously awarded a 2010 Medal of Freedom at the White House on Tuesday. (Associated Press)

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President Obama gestures Tuesday during a news conference on the White House complex in Washington. (Associated Press)

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President Barack Obama shakes hands with former President George H.W. Bush after presenting him the 2010 Medal of Freedom during a ceremony in the East Room of the White House in Washington, Tuesday, Feb. 15, 2011. (AP Photo/Pablo Martinez Monsivais)

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

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President Barack Obama presents former President George H.W. Bush the 2010 Medal of Freedom during a ceremony in the East Room of the White House in Washington, Tuesday, Feb. 15, 2011. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama awards the 2010 Medal of Freedom to artist Jasper Johns during a ceremony in the East Room of the White House in Washington Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)

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President Barack Obama reaches up to present a 2010 Presidential Medal of Freedom to basketball hall of fame member, former Boston Celtics coach and captain Bill Russell, Tuesday, Feb. 15, 2011, during a ceremony in the East Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama stands with Libby Little, whose husband Dr. Tom Little, an optometrist killed in Afghanistan, is posthumously awarded the 2010 Medal of Freedom during a ceremony in the East Room of the White House in Washington, Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)

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President Barack Obama awards the 2010 Medal of Freedom to Warren Buffett during a ceremony in the East Room of the White House in Washington Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)

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President Barack Obama kisses author and poet Maya Angelou after awarding her the 2010 Medal of Freedom during a ceremony in the East Room of the White House in Washington Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)

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President Barack Obama awards cellist Yo-Yo Ma the 2010 Medal of Freedom during a ceremony in the East Room of the White House in Washington, Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)

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President Barack Obama awards baseball hall of fame member, former St. Louis Cardinals great Stan "The Man" Musial the 2010 Medal of Freedom during a ceremony in the East Room of the White House in Washington, Tuesday, Feb. 15, 2011. (AP Photo/Charles Dharapak)