She may have standing yes. She was a candidate, so yes she would have standing. Only problem is, she seems to be marching in lock step atm....
Seems as though McCain would have standing to question this, but it would be political suicide for him to file a lawsuit at this time.
It seems to me that since he is a Sanator in the state of Illinois, anyone in that state would have standing to ask the question and expect a document that proves that he is a U.S. citizen. I don’t think you have to be born a U.S. citizen to be a Senator, by you do have to be a citizen. Why can’t someone in Illinios file the same suit?