President Barack Obama, first lady Michelle Obama and their daughters Sasha, second from left, and Malia react as the girls flip the switch to light the National Christmas Tree during the 90th annual National Christmas Tree Lighting on the Ellipse, Thursday, Dec. 6, 2012, in Washington. This year's giant blue spruce is new, transplanted in October on the Ellipse, south of the White House. (AP Photo/Carolyn Kaster)
