Barack Obama

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President Barack Obama and Vice President Joe Biden are briefed by Rob Nabors, Assistant to the President for Legislative Affairs, Saturday, July 30, 2011. (Official White House Photo by Pete Souza)

President Barack Obama returns a salute as he steps off the Marine One helicopter as he arrives at Walter Reed National Military Medical Center in Bethesda, Md., Tuesday, Nov. 5, 2013, for a private visit with wounded military personnel and their families. (AP Photo/Pablo Martinez Monsivais)

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** FILE ** President Barack Obama laughs while walking with senior adviser David Axelrod following an event at the Costa Mesa Town Hall at OC Fair & Event Center in Costa Mesa, Calif., March 18, 2009. (Official White House Photo by Pete Souza)

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Vice President Joe Biden listens at left, as President Barack Obama speaks during a meeting with business leaders to discuss immigration reform, Tuesday, Nov. 5, 2013, in the Roosevelt Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama meets with business leaders to discuss immigration reform, Tuesday, Nov. 5, 2013, in the Roosevelt Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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** FILE ** Vice President Joe Biden and President Barack Obama look at an app on an iPhone in the Outer Oval Office, Saturday, July 16, 2011. (Official White House Photo by Pete Souza)