The question of standing asks, do the supporters of Prop8 have a right to defend this case in appeal? The Governor and Attorney General refuse to defend Prop8. Because this falls under California law, the 9th Circuit (federal) court has sent this "certified question" back to the California Court, which moves slowly and will consider it in the fall.
Several groups have filed amicus briefs in this case, and I thought you might be interested in this one, from a large coalition of faith groups, including (among others) California Faith for Equality, the California Council of Churches, and Episcopal Bishops Marc Andrus (CA) and Jon Bruno (LA). Yay, Bishops! The brief takes down the argument that the proponents are somehow protecting religious liberty. It concludes,
Proposition 8's proponents may believe that the federal constitution accords same-sex marriages celebrated in Unitarian Universalist churches and Reform Synagogues less dignity and regard than the mixed-race marriage of Catholics at issue in Perez.*
But they suffer no particularized injury when the fundamental rights of others are sustained, and same sex couples are permitted to marry.
Same-sex marriages celebrated in Unitarian Universalist or other churches, in Reform Synagogues, or indeed, in the county clerk's office before a secular employee, threaten no harm to the religious liberty of those whose churches or synagogues disallow same sex unions.
Nor do Proposition 8's Proponents possess any special Commission to act as representatives of the People, and to override the authority and discretion that California's Constitution has vested in the Governor and Attorney General to represent the people's interest in litigation.
*Perez v. Sharp was the case in California that challenged anti-miscegenation laws in 1946
It is estimated that 18,000 same sex couples married prior to the passage of Prop8 in California, including yours truly. These marriages remain legally valid. Since then, other lesbians and gays are only allowed to enter into Domestic Partnerships, which are supposed to give them all the same rights except for the name. If you want to read more about the Prop8 case, visit my other blog, Gay Married Californian.