Wonder if he knows? He was abandon by his mother and his dad...his commie gramps and grandmother were actually the only people he could ever consider his parents.
I do wonder about the possibility that the "father" listed on his BC is someone other than Obama Sr. and if that explains his reluctance to settle the BC issue. What I don't get is why he avoided revealing the truth long ago, if that is the case, because it immediately garners him sympathy from just about everyone - "Oh, the poor child grew up not even knowing who his real Dad was..." There's really not much of a stigma attached to having bad parents; in fact, bad parenting seems to be the norm, now days.
Even if he admitted it now, after the book about his dad's "Dreams" and stuff, we'd still likely forgive and forget if he simply explained that he did not 'discover the truth' until recently (or at least made-up some plausible explanation for keeping it a secret.) We have certainly pieced together enough of his childhood to accept a story from him about his 'turbulent family life' or some such notion.
At this point, I'd be happy to discover that his father actually was a US citizen. Then, I could concentrate on him just being a bad President, not a bad AND illegitimate one...