Team Obama’s legal argument, from OpEdNews — http://www.opednews.com/articles/Is-Barack-Obama-Natural-Bo-by-Hargrove-081207-817.html — in a nutshell is as follows:

The Framers elected not to define “natural born citizen,” except by exempting themselves, which self exemption “could be due the fact that they were not born in the United States without regard to whether or not they had been subject to British jurisdiction,” and the Framers’ lack of concern about dual citizenship or loyalties is shown by their only requiring Presidents to have been residents in the United States for 14 years — meaning an eligible candidate born in the United States still could have resided under the jurisdiction of another country for 21 years or more; and even if the Framers WERE concerned about split loyalties, those were intended to be addressed on a “case by case basis” — and it would not be reasonable to conclude that Obama would have British loyalty since the British Citizenship conferred on him at birth was only “due to his biological relationship to an estranged and unfamiliar father.”

Team Obama concludes that the Framer’s definition of “Natural Born Citizen” is the same as “Citizen” meaning all that is required is birth in the United States, even if neither parent is an American Citizen.

I’d say, if that’s all they got, Leo’s case is a slam dunk!