I'm obviously for equal marriage rights for all adults, or for none. The church is free to do whatever it wants, but when the government gets involved, it is legally bound to make the same laws apply to ALL citizens, not just the chosen few. So, if the government wants to get out of the marriage business altogether (and repeal all laws that refer, even tangentially, to marriage) that would be best, and leave it to the church to administer marriages.

I feel fairly certain that there are several on this site against it, but most likely you won't get more than one or two to voice that opinion.