Lest we forget the claim that Frank Marshall Davis is the real Father...
If Davis were the father, then Obama would be natural born and eligible to be POTUS. Of course, there’d be allegations of fraud and forgery & all that, but he would be president.
Who the heck is he? Or more pertinent, is/was he an American citizen? Also, that confuses things because LEGALLY the “father” is defined as the husband even if not genetically, that is still the law in many states, but even if Obama Sr was the “husband” that marriage was theoretically invalid since he was already married to another woman, so in actuality he would not legally be the Father if it can be established they were not married, that is only if this other guy was the biological father. But if the marraige was considered legal in because in US and previous wife in Kenya, then Obama legitimate and Obama Sr is legally the father even if not biologically, and from him Obama derives his citizenship status ....that is a tangled mess.