Check out the whole story here at Fuse #8. She even has a pdf of the actual letter from then (mid October!) Senator Obama.
Some kids did that old tried and true lesson where they sent a hand made "Flat Stanley" to someone so he can have more adventures. This whole class of third graders sent theirs off to various celebrities but only one got a reply. Here's the newspaper article: Obama's Letter Was Answer to Little Boy's Request.
How cool is that?
(photo cc petitshoo, flickr)