But the fact that someone wrote the word "Indonesian" on a school form isn't proof that he actually had his citizenship changed. I understand his stepfather was an important person, they may just have pushed through the paperwork to get him in school as a favor. I think that the burden of proof would be on those claiming his citizenship was changed to seek out the Indonesian citizenship documents. If it never happened, then there wouldn't be any documents proving it never happened, so there would be no way for Obama to produce evidence that something never happened.
At the time, if he was 5 years old when he moved there, he would have automatically been considered an Indonesian citizen should his step-father have adopted him (as demonstrated by the name change to his step-father's surname on his admission records). If this is the case, no documentation would have been necessary for the citizenship change - it was automatic because of age.
Again, this is why it's so complicated - there are many questions about what actually happened (just like with his birth) that are not being answered. There may be posts of scanned pictures of stuff, but there are no answers. Instead of walking into court where the legal question has been raised and simply responding - putting to rest the theories and speculation and doubt and wonder, Obama is doing every legal machination he can to make the questions go away. While I think there is more than likely nothing to all of this, his response makes me question that assumption more than the evidence against him does.