Could he be listed on the cert as "white" or "caucasion"--since his mother was white?
But the most intriguing conspiracy is that Ann was not his mother and O Sr was not his father, a case made provocatively by Jack Cashill at American Thinker. Instead, Cashill suggests that O's grandfather is really O's father, and the mother some unknown prostitute that Frank Marshall Davis hooked him up with. It also explains a lot of other peculiar things in O's background, such as Ann's ability to easily leave the young Barack to pursue her career. It would also explain the weird marriage of Ann and O Sr, who didn't seem to have ever lived together.
He looks just like Frank Marshall Davis IMO.