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US President Barack Obama and first lady Michelle Obama walk through the Cross Hall to the East Room of the White House on February 29, 2012 in Washington. Obama and his wife Michelle hosted a dinner for members of the US armed forces who served in Iraq and Afghanistan.     AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images) Brendan Smialowski, AFP / Getty Images