Simple minded explanations usually aren't. They are also usually wrong.
The chick and Obama were born on US soil. They can run for President after age 35 if they have lived as American citizens
The 14th amendment didn't re-write presidential eligibility requirements. Giving slaves citizenship did *NOT* make anyone born here a "natural citizen."
That is the wrong headed nonsense that got stuck in people's minds and is difficult to pry out of them, despite the fact that we have all sorts of examples (like the Indians) to prove it is incorrect.
Re: 150 - American Indians are a unique situation, as the U.S. Government negotiated treaties with essentially indigenous nations. And some treaties conveyed citizenship such as the Treaty of Dancing Rabbit Creek. And “Indians not taxed” were excluded from citizenship via the Civil Rights Act in the late 1860s. Then there was the Dawes Act which tied citizenship to land alottments. All very interesting.
You do not honestly believe that any US Supreme Ct Justice, in the last 50 years, or in the future, is going to publish an opinion stating black people or women born in the US couldn’t have been president as a support to your argument, do you? They will be laughed off the Court.