McCain's birth certificate says he was born in Panama.
Obama's says he was born in the USA.
If McCain had been elected and anyone wanted to bring a lawsuit against him saying he wasn't born in the USA, the answer from the right would be: he was born to US citizens.
Obama's mother was a US citizen when he was born in Hawaii. But if he had been born in Panama?
The hardline rightwing will never be satisfied with proof. Reality has nothing to do with their arguments. or very little. The reality is, for them, Obama is "other" and "other" is frightening and one of the forms fear most often takes is anger.