Luz Graham-Urquilla, 4, watches President Barack Obama as he signs her drawing at the Resolute Desk in the Oval Office, May 25, 2012. (Official White House Photo by Pete Souza)
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President Barack Obama greets members of the Rolling Thunder in the Diplomatic Reception Room of the White House, May 25, 2012. (Official White House Photo by Pete Souza)
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President Barack Obama greets people on the tarmac at Des Moines International Airport following his arrival in Des Moines, Iowa, May 24, 2012. (Official White House Photo by Pete Souza)
