The California Supreme Court has upheld the gay marriage ban enacted through Proposition 8, but ruled that the nearly 20,000 gay marriages enacted before the constitutional amendment can stand.
From the CA Supreme Court decision: Separate is equal....
Contrary to petitioners' assertion, Proposition 8 does not entirely repeal or abrogate the aspect of a same-sex couple's state constitutional right of privacy and due process that was analyzed in the majority opinion in the Marriage Cases — that is, the constitutional right of same-sex couples to "choose one's life partner and enter with that person into a committed, officially recognized, and protected family relationship that enjoys all of the constitutionally based incidents of marriage" . Nor does Proposition 8 fundamentally alter the meaning and substance of state constitutional equal protection principles as articulated in that opinion. Instead,the measure carves out a narrow and limited exception to these state constitutional rights, reserving the official designation of the term "marriage" for the union of opposite-sex couples as a matter of state constitutional law, but leaving undisturbed all of the other extremely significant substantive aspects of a same-sex couple's state constitutional right to establish an officially recognized and protected family relationship and the guarantee of equal protection of the laws.
To the question of whether previously sanctioned gay marriages remain legal:
Finally, we consider whether Proposition 8 affects the validity of the marriages of same-sex couples that were performed prior to the adoption of Proposition 8. Applying well-established legal principles pertinent to the question whether a constitutional provision should be interpreted to apply prospectively or retroactively, we conclude that the new section cannot properly be interpreted to apply retroactively. Accordingly, the marriages of same-sex couples performed prior to the effective date of Proposition 8 remain valid and must continue to be recognized in this state.