The Archdiocese has issued this statement that includes these excerpts:
. . . Why was it done? Some voices in the wider community declare that there could be only one motive: hatred, prejudice and bigotry against gays, along with a determination to discriminate against them and deny them their civil rights. That is not so. The churches that worked in favor of Proposition 8 did so because of their belief that the traditional understanding and definition of marriage is in need of defense and support, and not in need of being re-designed or re-configured.
Some of our opponents respond with this question: Even if these churches saw the California State Supreme Court decision in May as damaging to the institution of marriage as they understood and valued it, shouldn’t they have kept quiet and stayed on the sidelines? Some would say that, in light of the separation of church and state, churches should remain silent about any political matter. However, religious leaders in America have the constitutional right to speak out on issues of public policy. Catholic bishops, specifically, also have a responsibility to teach the faith, and our beliefs about marriage and family are part of this faith.
Indeed, to insist that citizens be silent about their religious beliefs when they are participating in the public square is to go against the constant American political tradition. Such a gag order would have silenced many abolitionists in the nineteenth century and many civil rights advocates in the twentieth. Quite a number of important political issues regularly touch upon the ethical, moral, and religious convictions of citizens: immigration policy, the death penalty, torture of prisoners, abortion, euthanasia, and the right to health care are some such issues.