Obama Presidential Eligibility - An Introductory Primer
http://people.mags.net/tonchen/birthers.htm
Follow the links in the article to catch up.
In the same case, the Supreme Court also said that, if you were born in the United States and one of your parents was not a U.S. citizen when you were born, your natural born citizenship is in doubt. So far, the Supreme Court has not resolved this doubt because, until now, there has never been any need to do so.
Looks like the strongest "precedent" comes from an 1874 ruling. There the second part of the court's ruling was that citizenship was "in doubt"...a non-definitive statement to say the least. To be basing much of this largely on such a nebulous ruling will likely result in nothing. It could very easily go the opposite way, especially since we've already had a President whose father was not a US citizen (Arthur).
IMO this is barking up the wrong tree. I want that birth cert to be released as well as other documents that Oshama has kept hidden because I believe there is damning stuff there, but I don't think the natural born thing is a good strategy, though I know some are convinced it has merit.