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President Barack Obama shows Washington, D.C. area students, who were featured in the Washington Post, the valet button on his desk during their surprise visit to the Oval Office, Feb. 5, 2010. (Official White House Photo by Pete Souza)

First Lady Michelle Obama hugs student Tammy Nguyen in the Red Room of the White House before an event announcing a campaign to combat the rapidly growing problem of childhood obesity while Tiki Barber checks his notes before they take the stage, Feb. 9, 2010. (Official White House Photo by Samantha Appleton)

The left hand of White House Press Secretary Robert Gibbs shows a shopping list featuring “Eggs, Milk, Hope and Change” during Gibbs’ daily news briefing at the White House in Washington February 9, 2010.