President Obama, first lady Michelle Obama and their daughters Malia (left) and Sasha walk across the South Lawn of the White House on Aug., 26, 2011, after a family vacation on Martha's Vineyard. (Associated Press)
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President Obama, first lady Michelle Obama and their daughters Malia (left) and Sasha walk across the South Lawn of the White House on Aug., 26, 2011, after a family vacation on Martha's Vineyard. (Associated Press)
