Sorry. Gave you the wrong link. This is the right one:
http://www.obamaconspiracy.org/2009/01/the-great-mother-of-all-natural-born-citizen-quotation-pages/
You will note that Perkins is addressed therein.
Three comments:
1) FYI, Perkins v. Elg isn't a SCOTUS case. It's an appeals court case. I'm only pointing this out so we have our facts straight. Despite being only an appeals cour decision, it's still binding precedent, since it was never overturned by SCOTUS. In fact, it was cited in later SCOTUS decisions. Again, I'm just pointing this out to make sure we get the facts straight, not to deminish the importance of the case, which I accept as binding precedent.
2) Nothing in the Perkins case supports the birther claim that one needs two citizen parents to be a natural born citizen.
3) Perkins contradicts the claims of some birthers that dual citizenship negates natural born status. From the link above:
"And the mere fact that the plaintiff [Elg] may have acquired Swedish citizenship by virtue of the operation of Swedish law on the resumption of that citizenship by her parents does not compel the conclusion that she has lost her own citizenship acquired under our law .
"The court below, properly recognizing the existence of an actual controversy with the defendants [page 350]
.. declared Miss Elg 'to be a natural born citizen of the United States,'"
Then why does it say "US SUPREME COURT" at the top of the decision?