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U.S. first lady Michelle Obama joins students at the food line to pick up lunch items at the cafeteria of Parklawn Elementary School January 25, 2012 in Alexandria, Virginia.
U.S. first lady Michelle Obama joins students at the food line to pick up lunch items at the cafeteria of Parklawn Elementary School January 25, 2012 in Alexandria, Virginia.

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Four years in, is First Lady Michelle Obama's "Let's Move!" campaign working?