I say Malcolm X for the daddy betting pool.
Personally, I suspect that BHO is Saudi/Indonesian and that his long form birth certificate is unavailable because the Dunhams adopted him as an infant. I am always amazed when there is footage on TV from Jakarta, because there are so many males who look like first degree relatives of BHO.
However, there are LOTS of freepers and LOTS of pundits who believe that Barry Soetoro is the son of Malcolm X:
Who is BHO's REAL father? --- http://www.freerepublic.com/focus/f-chat/2124444/posts
Is Obama the secret son of Malcolm X? --- http://www.freerepublic.com/focus/f-news/2123245/posts
Obama Wars: Barack, who is your father? --- http://www.freerepublic.com/focus/f-chat/2119066/posts
Malcolm X - gay black hero? --- http://www.freerepublic.com/focus/f-bloggers/1709651/posts