This does raise an interesting question of why Obama fought so hard against releasing his own Hawaiian "birth certificate". By this same reason as long as his mother was an American citizen at the time of his birth it would not matter if her were in fact born in Kenya, as many have believed.
Well, in Obama’s case, birth outside the country would matter because his mother was three months shy of being able to transmit citizenship to him.
The law requires the one citizen parent to be physically present in the U.S. for five years after the age of 14. Stanley Ann Dunham was three months shy of being 19.