“If Obama’s father was a Kenyan then how could Hussein be eligible to be POTUS?”
I’m not sure it matters, some of our earlier presidents were born to parents who weren’t Americans, because the United States of America did not yet exist, so it seems to me that natural born citizenship is dependent on birth in the United States and not on the citizenship of the parents. For instance, Andrew Jackson’s parents immigrated from Northern Ireland in 1765, and in 1767, his father (Andrew Jackson Sr.) died 3 weeks before Andrew was born in South Carolina. I don’t know if Jackson’s father was officially a citizen yet of the colony of South Carolina at the time of his death, but would it even matter?
The Constitution understood that question and addressed it. Those people were grandfathered in.
The founders exempted themselves, or none of them would have been able to serve. That’s in the eligibility clause.