If the superdelegates end up deciding this thing, I do see another option for the SDs deciding which way to go: they could go for the "whoever wins the 'popular vote'" option, as opposed to "Whoever has the lead in legitimate pledged delegates." The Clinton camp has, I think, a very small (~200,000?) lead in the 'popular vote,' although who knows if this will last.

If, at the convention, one campaign leads in pledged delegates, but the other one leads the popular vote, I would expect all hell to break loose, with each side saying that the category they lead in is the TRUE barometer of the democratic party. In this case, the only scenario I can see working would be a Clinton / Obama ticket.

IMO, neither pledged delegates nor the popular vote are a good measurement of the sense of the democratic party - caucus states will always have a much lower turnout, and so the popular vote total is weighted against them. And of course, delegate math makes no sense at all.