We have been saying it repeatedly in these threads. But the catch is, you still need the original BC to hold up in a court of law as evidence. Just because Hussein "claims" his daddy was O. Sr., doesn't mean it's legally true. The court doesn't care about what Hussein, um, Ayers wrote in Dreams because it needs a verifiable document.
I don't think you need the long form. You could use Obama's own forgery against him, since it still disqualifies him, and is an admission against interest by him.