Most of the same groups also oppose civil unions/domestic partnerships, would seek to re-impose laws banning oral and anal sex, cross-dressing, hate crime laws and employment discrimination laws. Do you remember what Prop 6 was all about?
You may not know it, but within my lifetime states have criminalized dancing with the same gender, gathering in bars which cater to gays and a whole host of such laws.
That is the religious right's agenda.
I doubt that they can't push much farther, especially with the Supreme Courts knocking down any "win" they might have at the polls. To me, this whole thing is just a waste of money since it always ends up on the desks of the supreme courts and they'll make the final decision.