First Lady Michelle Obama reacts while talking on the phone to children across the country as part of the annual NORAD Tracks Santa program. Mrs. Obama answered the phone calls from Kailua, Hawaii, Christmas Eve, Dec. 24, 2012. (Official White House Photo by Pete Souza)

First Lady Michelle Obama reacts while talking on the phone to children across the country as part of the annual NORAD Tracks Santa program. Mrs. Obama answered the phone calls from Kailua, Hawaii, Christmas Eve, Dec. 24, 2012. (Official White House Photo by Pete Souza)