But what if he is found, by a Federal Court to be ineligible and not the President, but rather a usurper, acting as President? If Obama is found ineligible and not the President then he loses all authority, all power, and all the protections of the office. Federal Marshals could walk in and remove him, you don't need the Army and Marine Corps to do that.
What an amazing sight that would be! I can't even guess what the next 48 hours or so would be like after such an event. Perhaps we will find out. Good to know Sotomajor is on the job now to straighten out all the legalities should that happen.