The baby born on us soil to an
American Citizen is a US citizen.
If unwed at time of birth to decide if a child had two USC parents I would guess one would apply standards for passing citizenship by father to a child born outside (and outside of wedlock) of the US. The father must be a citizen. There must be clear and convincing proof of a blood relationship with the child. He must acknowledge the child under oath (or have a competent court declare such)and agree to provide financial support until the child is 18 years old.(unless the father is dead) The child must also be legitimized under laws of residence of the father before the child is 18.
see 8 USC 1409
Ok. Well what we have here though is 'citizen' singular. Not plural. As in parent (i.e. mother- which you're always going to have present at the birth- no getting around that one) and not parents.
I guess if you think about it you can see where I am going. Here in this example, all that is needed is the woman to be an American citizen and the father to be unknown in order for the child to be perceived as natural born.
Let's say it (the question of where the child's father has been born) is never drawn into question (for the sake of argument) during the child's life and the child really doesn't have a clue who his father is but his mother suspects there is a small chance it could be that Mexican guy she slept with in Acapulco that time (or whatever). Would the child be able to run for POTUS? If the public found out the mother had slept with the pool boy in Acapulco 9 months prior to the child's birth, would it be reasonable of the public to demand some sort of proof that the father wasn't Mexican? Would the child's loyalties even be an issue?
What I'm digging at here is to find out what our perceptions are about what makes a person a legitimate citizen or not. This has to be done in an example not about Obama in order for us to be a little bit objective about it. Then once we figure out how we perceive this question and its possible answers we can begin to see how it relates to the President and how the public will perceive this whole thing and what is reasonable for someone to question and what not.