WASHINGTON - JULY 4:   U.S. President Barack Obama (R) greets guests at a home at Ft. McNair upon his return from Camp David on July 4, 2009 in Washington, DC. President Obama will spend the Independence Day holiday at the White House before departing tomorrow for Russia. Getty Images logo Getty Images 4 months ago

WASHINGTON - JULY 4: U.S. President Barack Obama (R) greets guests at a home at Ft. McNair upon his return from Camp David on July 4, 2009 in Washington, DC. President Obama will spend the Independence Day holiday at the White House before departing tomorrow for Russia.