How does Obama lose? He really doesnt. He already was president for 2 terms. He can say he didnt know his citizenship status. Even if its proven he went to college paid for by his country Indonesia, he could say that he was a dumb teen and he thought that was how his family could afford college. He definitely could say he never knew he was never an American citizen.
(He knew damn well. But he has plausible deniability, as far as the loving media goes)
Legally Pelosi might be in more of a bind that he is. On the basis of what document did you assert his eligibility?