WASHINGTON, DC - DECEMBER 06: U.S. President Barack Obama, sings a Christmas song with his daughters Malia (3rd-L) and Sasha (2nd-L), first lady Michelle Obama (L), Actor Neil Patrick Harris (2nd-R),... more 

WASHINGTON, DC - DECEMBER 06: U.S. President Barack Obama, sings a Christmas song with his daughters Malia (3rd-L) and Sasha (2nd-L), first lady Michelle Obama (L), Actor Neil Patrick Harris (2nd-R), and Rico Rodriguez (R),during the annual lighting of the National Christmas tree on December 6, 2012 in Washington, DC. This year is the 90th annual National Christmas Tree Lighting Ceremony. (Photo by Mark Wilson/Getty Images) less