U.S. President Barack Obama and family greet children, dressed as elves, at the Christmas in Washington celebration in Washington
U.S. President Barack Obama, first lady Michelle Obama and their daughters Sasha (L) and Malia greet children, dressed as elves, at the Christmas in Washington celebration at the National Building Museum in Washington December 11, 2011. REUTERS/Yuri Gripas (UNITED STATES - Tags: POLITICS ENTERTAINMENT)
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