Jim,
Do you think that it is possible that Bill Ayers wrote President Obama's book?
As far as I know, Santa Clause could have written it.
My best guess is that Bill Ayers had a hand in writing it, like maybe was a ghost writer.
Writers oftentimes employ people they know and trust to help them write autobiographies, since so many years are covered usually and one cannot reliably go on pure memory. Especially such endeavor needs support if one is planning to use the bok as the clarion call for a POTUS campaign.
So while I don't know what role Ayers had, I think it likely he helped a lot, and I think his admission to writing the book may be abit of hyperbole. Can a ghost writer say he wrote the book he 'ghost wrote'?
Point is, this flies full contrary to Obama's claims of not knowing Ayers.