Why would Catholics object to the proposition that one could object to same sex marriage as a Catholic ceremony, but defend its inclusion as part of the secular world? In the same way that, although Catholics presumably believe that their faith is the correct one, most would defend the right of other religions to practice even if they vehemently disagreed with them. Supporting legalization of same sex marriage does not mean it has to be permitted inside the Church.
I can understand that for certain kinds of issues that separating the two is impossible for many. The abortion issue would be a good example. I would not expect Catholics to accept that its alright as long as it is not performed in Church. However gay marriage does not seem to be the kind of issue that would require supporting a particular public policy as requirement of living a Catholic life. One should be able to support its acceptance in the public sphere, but reject its inclusion as a Catholic ceremony
This post demonstrates how misunderstood this issue is among many persons who are not Catholic, and an alarming number of those who ARE Catholic. If you’re not a Catholic, of course we’d rather you see it our way,

, and we’ll pray for you if you don’t, but no Catholic has been given power over Non Catholics unless something happened while I was asleep last night.
We are also called as Catholics to vote as Catholics when we live in a democratic society that allows such things. As long as issues of same sex marriage keep coming up, the faithful Catholic citizen will vote against it. To be fair, many don’t vote against it, and that is a problem caused by the confusion of liberalism and modernity in pluralistic society bleeding into the lives and thinking of the Church faithful. Not into the Church’s doctrine, but into her followers. Catholics who believe and practice the doctrines of the Church do not support same sex marriage.
It’s not about the ceremony, or where it’s held, or who officiates it, or whatever. It’s about persons of the same gender having sex together. Now matter how much secular society condones it. Heck, even if secular society made it mandatory, it wouldn’t effect the Church stand on the matter. It’s not a matter up for grabs. The Church doesn’t have political parties. We don’t have a changeable party platform that we can be persuarded on by angry non Catholics, or confused cafeteria Catholics.
Also, even as it stands now, If a gay couple are not Catholics, then they’re not going be coming to the Catholic Church for blessings or ceremonies anyway. If they the gay couple ARE Catholics, then taking it down the street to the city gazebo doesn’t change the fact that it’s against Catholic doctrine, and they’ve got some issues to deal with in their spiritual life.
For Catholics, a man and a woman who are married to each other, and are open to life should celebrate the marital embrace. All others are to live a life of chastity. It’s pretty simple in theory, though there is no illusion on anyone’s part that it is easy to practice. It is just what is. We all have temptations to do other than God would have us do. It’s part of the cross we all must bear. Homosexuals are tempted by sodomy and fornicatons. Heterosexuals who are not married are tempted by fornication. Married heterosexuals are tempted with adultry, and fornication, and some married heterosexuals are tempted by adultry, fornication and sodomy. So in the sense of sexual union apart from the man and wife, even married people are called to chastity. It is the natural Catholic state of being unless marriage occurs. So that’s the Catholic doctrine simplified.
It’s not changeable due to society, secularization, changing norms, politics, frustrations, demonstrations, ballot issues, or civil law etc. And when a Catholic Christian “supports” these things, they are being untrue to their faith, and complicit in evil. We may end up having to live in societies which are very much anti Catholic in their philosophies, humanity, etc., but as long as we have choice on ballots, we are not supposed to HELPING society be given over to sin. If we have the ability to vote against such thing on ballots, then we have a DUTY to vote against such things on ballots.
Having said all this, of course we don’t have “vote police” or anything, and Catholics are VERY big on free will. The Church offers guides, at least in the US, I know the USCCB has a guide to help voters use their faith to inform their voting decisions, but in the end, we must be in conformance with our own conscience, and willing to explain or justify ourselves to God for what we’ve done. If we’ve done wrong, we’ll know it, and we have the awesome gift fo the sacrament of reconciliation.
May God bless you,
Steven