So, who determines if Obama is operating within the legal confines of the office he holds?
The principle of judicial review was established in a landmark 1803 Supreme Court case called Marbury v. Madison. So, it's the judiciary who enjoys and frequently exercises such review.
The Congress also has oversight authority, to include the power of impeachment. In fact, the Constitution only confers upon Congress the power to remove a sitting President.
So, who determines if Obama is operating within the legal confines of the office he holds?
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The "judge" who said the issue had been "twittered" and "blogged" and "massaged" by the "vigilant" citizenry (in between watching episodes of Dancing with the Stars, etc.), as well as the honerable and ethical "mainstream" media. Oh, and a few around FR who lurch at the opportunity to gloat on these "eligibility" threads. That's who.
/s