The Barack Obama campaign itself - i.e., Obama for American and not ACORN - turned in 15 bogus voter registration forms in St. Charles County, Missouri (link). However, that might be out of 3000 total that they submitted, and the person who turned those registrations over to the FBI and discussed this with the media, St. Charles County elections directorRich Chrismer, may be a McCain supporter. The total and Chrismer's links haven't been confirmed, and might just be noise from Obama supporters in the comments at the link.