Theres a broad discussion of legal standing in the 2006 ruling on Tom Delays qualification case. http://www.ca5.uscourts.gov/opinions/pub/06/06-50812-CV0.wpd.pdf
Of course, by definition, any citizen in a republic would have standing. However the burden of proof may be on the accuser.
If Obama is found ineligible I’d be surprised if the Democrat Party wasn’t found negligent and financially liable to it’s donors LOL!
ML/NJ