(AFP OUT) U.S. President Barack Obama (2nd R), first lady Michelle Obama (L), and daughters Malia (R) and Sasha (2nd L) greet Christmas elves as they attend the "Christmas in Washington" concert at the National Building Museum on December 9, 2012 in Washington, D.C. The concert benefits the National Childrens Medical Center and is hosted by comedian Conan O'Brien.
( - Source: Pool/Getty Images North America) see more angles »
( - Source: Pool/Getty Images North America) see more angles »
