Preachers/priests/rabbis already have the right to choose whose marriages they preside over. It's not like priests are required to marry a couple of divorcees, or an Orthodox Jew has to preside over the wedding of a couple festival Jews.
The silver lining to the lies supporting the Prop 8 campaign is that the anti-gay movement has realized open, hostile homophobia is becoming publicly verboten. We can look forward to several decades of code words on these issues.