Opponents of same-sex marriage may feel, subjectively, that something would be imposed on them by the state's decision to recognise same-sex marriages. But what is that something, exactly? It's much easier to show how the state is concretely imposing on gays by denying recognition for same-sex marriages. In a pluralistic society, you can't claim to have been harmed when the state declines to impose your religious norms on those who don't share them. And without some such claim to justify it, Proposition 8 is looking pretty constitutionally shaky right now.