To be clear, I think he was born in Hawaii and this is thus a non issue. But to play along...
Assume he was born in Kenya. As long as ONE of his parents (his mom in this case) was a US citizen, it does not matter that his father was not or that he was born in Kenya provide his mom lived in the US for at least ten years (which she did) and that five of those years were after turning 14... now this is the catch... if she had him in Kenya, then she would not have quite made the 5 year part.
That is the requirement by US law. I posted the actual law on another thread on this topic. So technically, he would not have been a natural born citizen had he been born outside of the US.
That said... records show that his father was still attending the University of Hawaii from which he graduated in June of 1962. So what reason would his mom have had for going to Kenya if Obamas father was still in Hawaii???????
This is why I hate conspiracy nuts.... they dont pay attention when the FACTs prove their conspiracies are false.