Here’s an interesting scenario. If Obama is ruled ineligible to be POTUS before he is given the oath of office, then I would suspect that the electors for Obama would be ruled ineligible and since McCain would not have enough electors to be elected on the first vote, then the election would fall into the house of representatives. If the election is dropped into the lap of the house of representatives, there is only one likely candidate to emerge as POTUS. And we all know who she is.
I would try first to argue that if one of the candidates is ineligible, then the other candidates were the only true candidates running for the presidency: McCain, Bahr, Baldwin, McKinny.
The winner take all delegates would then go to McCain SINCE he was the only legitimate candidate.