The Justices will consider things like the Federalist Papers, Blackstone's Commentaries, and other documents of the time. They'll probably look at the differences between "citizen" and "subject," and how that relates to Art 2, Sect 1, Clause 5.
I have come to the conclusion, that this is what they will have to do, in order to make a valid determination of what the Framers meant by Natural Born Citizen in the Constitution.
And, until Barry Obama shows up with some documentary evidence, we won't know how this will affect him. He's playing a waiting game with this, which does not bode well for his real status. The longer he stonewalls, the deeper the public suspicion about him.
“I have come to the conclusion, that this is what they will have to do, in order to make a valid determination of what the Framers meant by Natural Born Citizen in the Constitution.”
Don’t forget the 14th amendment. It set qualifications for who could be considered a citizen at the time of his birth.