The US citizenship laws on the books at the time of Obama's birth said that in order to convey US citizenship to a child born of a US citizen and a foreign national, that the US citizen parent had to have lived within the US for a period of ten years, five of those being after the age of 14.
First, let me say that I am an ardent supporter of the position that Baraq Hussein 0bama IS NOT qualified to be President.
But I believe that IF the Supreme Court decides to hear this case, they will rule that even though 0bama wouldn't qualify under the laws in place at the time, subsequent laws supersede them and he is qualified. This lets them off the hook.
Fortunately for us, they can't do that. It's called "Ex Post Facto", or "after the fact", and isn't legal under US law.
The laws on the books at the time of Obama's birth control his status.