What are you talking about? Joe LNU has said in several blog comments that he has secret documents from the Founding Fathers that absolutely prove the Birther argument, and he just hadn't thought to mention them until a year after the election.
Are you saying you don't trust Joe and his collection of secret 200-year-old documents? Sure, there was the secret "Whitey" tape that didn't exist, and the secret tape of Michelle confessing to her husband's Kenyan birth that didn't exist, and the secret divorce documents saying "one child, born in Kenya" that didn't exist, and so on, but these secret documents are real!
I suppose the law of averages says that they've got to be true on something someday, but I'm not convinced that this is the lucky one.