That would be interesting -
Biden takes McCain as his Veep. That would heal some divisions, though the center left mushiness of it will not help the country as a whole.
Curiously, it could end up with just Biden. A few months ago the Slimes ran an article where it interviewed a group of law professors (I don't have the link) who opined that McCain, having been born in the Canal Zone, was not a "natural born" citizen. If SCOTUS determined that argument to be correct and it was discovered that Obama was actually born in Kenya, we'd probably be left with Biden. Of course, we wouldn't need to worry about any threats from the rest of the world for a while because they'd be too convulsed with hysterical laughter about our Three Stooges level of ineptitude to do anything.
Nope. McCain is out of the picture. He lost. He didn't get the votes. If Obama is ruled ineligible then it'll be Biden and whoever he chooses as his vice-president.
“Actually, it depends on how they they rule. It could be McCain / Biden”
It IS a distinct possibility - disqualification of one member of a ticket might not disqualify the other ...