** FILE ** Joined by New York City Police Chief Raymond Kelly, second from left, first lady Michelle Obama speaks to children while promoting her "Let's Move!" exercise initiative at the Police Athletic League Harlem Center in New York, Thursday, Nov. 18, 2010.  (AP Photo/Kathy Willens)

Photo by: Kathy Willens

** FILE ** Joined by New York City Police Chief Raymond Kelly, second from left, first lady Michelle Obama speaks to children while promoting her "Let's Move!" exercise initiative at the Police Athletic League Harlem Center in New York, Thursday, Nov. 18, 2010. (AP Photo/Kathy Willens)