There also are cases coming from EC Electors that are pledged to McCain from several states. This according to the Democratic-Disasters group.
Certainly the Electors would have standing
Yes, I think however, if any of these come from electors legally required to vote for O based on their state's laws, that would have the most standing out of all, especially if they kept the case simple, requesting qualification verification to ensure they are not illegally voting themselves.