His 2012 opponents likely have standing on certain causes of actions pre-election.
No question. If the RNC or the Republican nominee wanted to explore this controversy, and to litigate it, standing,justiciability to include the courts ability to provide a remedy, would all easily be met. The case would be heard and decided entirely on its merits. And, it's a case that could be hear in either federal courts, or any of the other 50 state courts. Challenges to ballot access are litigated all the time.