California Supreme Court: Prop. 8 sponsors have standing

The majority opinion's conclusion:

"In response to the question submitted by the Ninth Circuit, we conclude, for the reasons discussed above, that when the public officials who ordinarily defend a challenged state law or appeal a judgment invalidating the law decline to do so, under article II, section 8 of the California Constitution and the relevant provisions of the Elections Code, the official proponents of a voter-approved initiative measure are authorized to assert the state‘s interest in the initiative‘s validity, enabling the proponents to defend the constitutionality of the initiative and to appeal a judgment invalidating the initiative."

The opinion. LA Times article.