I am not sure who gave this an AA rating but it is clearly still in dispute as of July, 2011. This article doesn't even mention his birth name through college as Barry Soetoro, which is rather well known.
The record released by the White House has also been shown to have been modified.
Hawaiian Court Subpoenas for Obama BC: http://politics.gather.com/viewArticle.action?articleId=281474979570812
I would at the very least question the validity of this data for an AA rating.