Obama may or may not have been eligible to serve as the President, but the most salient point is that he lied when he took the Oath of Office during his swearing in. He knew in advance that he was going to be working every day to weaken and impoverish the country rather than “preserve, protect and defend the Constitution of the United States”. His open and abject failure to obey his oath should be a crime in itself.
It is, perjury. But 0 has way more waiting for him than a perjury conviction.