U. S. Supreme Court Finds That Litigants Lacked "Standing" To Challenge California's Citizen Passed Proposition 8.

You can read the 5 to 4 decision here. The Court held:

"Article III’s requirement that a party invoking the jurisdiction of a federal court seek relief for a personal, particularized injury serves vital interests going to the role of the Judiciary in the federal system of separated powers. States cannot alter that role simply by issuing to private parties who otherwise lack standing a ticket to the federal courthouse."