It's a sad statement when the only real, thoughtful, discourse is on the Daily Show.
What the Right wants is a religious test for marriage. If you follow the "logic" then one day in this country you will be prohibited from marriage unless you are a "Christian".
Personally, I think this is a First Amendment issue. Either marriage is a religious sacrament or it is a legal contract under our laws. When you try to make it both you violate the separation of church and state.