US President Barack Obama speaks during a campaign stop in Sioux City, Iowa. AP Photo/Nati Harnik
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US President Barack Obama speaks during a campaign stop at the Living History Farms in Des Moines, Iowa. AP Photo/Charlie Riedel
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US President Barack Obama walks from the White House in Washington to Marine One en route to El Paso, Texas. AP Photo/Carolyn Kaster
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US President Barack Obama is expected arrive in India at 10am on Sunday. (AP file photo)
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US President Barack Obama wipes sweat from his face during a campaign event at Iowa State University in Ames, Iowa. AP Photo/Pablo Martinez Monsivais
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US President Barack Obama board Air Force One at Andrews Air Force Base, Md., en route to Ohio. AP Photo/Carolyn Kaster
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US President Barack Obama greet guests arrive at the first ever Kids’ "State Dinner" Luncheon in the East Room of the White House in Washington, hosted by first lady Michelle Obama. AP Photo/Pablo Martinez Monsivais
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US President Barack Obama with first lady Michelle Obama and their daughters Sasha and Malia, second from left, walk from the White House in Washington to a nearby church to attend services. AP Photo/Manuel Balce Ceneta
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This official White House photo shows US President Barack Obama, US Vice President Joe Biden, US Secretray of Defense Robert Gates, and US Secretary of State Hillary Clinton with members of the national security team as they receive an update on the mission against Osama bin Laden in the Situation Room of the White House, in Washington, DC. AFP Photo
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A local patron reacts to seeing US President Barack Obama during his unannounced visit at Bob Roe's Point After Pizza in Sioux City, Iowa. AP Photo/Pablo Martinez Monsivais
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US President Barack Obama sips his beer as he watches Team USA and Brazil during the first half of an Olympic men's exhibition basketball game, in Washington. AP Photo/Alex Brandon, File
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US President Barack Obama speaks to troops, servicemembers and military families at the 1st Aviation Support Battalion Hangar at Fort Bliss in El Paso, Texas. AP Photo/Juan Carlos Llorca
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US President Barack Obama runs to take the stage during campaign stop on the campus of Colorado State University in Fort Collins. AP Photo/David Zalubowski
