My thoughts on NOM and their stance?
If asked whether or not I support same-sex marriage, I'd tell you you're asking the wrong question, but if pressed, I'd have to side against it, but not for NOM's reasons. If they're concerned about their children learning that things like gay marriage are okay, where are these people decrying commercials for using hot ladies to advertise products? We call this softcore pornography, and it apparently doesn't bother them at all... and besides, even if it did, raising a child by keeping this sort of thing away from their eyes in perpetuity is the wrong way to do it. Teaching them that it's wrong is slightly better, teaching them to understand its repercussions is the master stroke that teaches them yet does not indoctrinate them.
As for why I don't support it, as I said earlier, it's my answer to the question asked, not my true opinion, which would restrict who can get married not based on their sexual orientation, but their reasons for marrying. Namely, as some communities have petitioned their same-sex-banning local governments, whether they plan to use this marriage to raise a family should be the defining question.
Why? Well, to start off, it's expensive in terms of time, money, and sanity to actually go through the procedure of getting married, even without a grandiose ceremony, and the people who marry out of love need a clue by four to each head involved that the things they want to spend their life doing do not need this little piece of paper. They can live together, they can share their lives until the day they die, it's not practical for them unless they're doing it simply to show off, and if so there are far better ways to do it.
"But there are health benefits! Businesses offer discounts to married couples! Etc, etc..." Yes, I know, and although it's a little more socialist than I like to admit, why should we give these benefits away needlessly to people who do so only to show off their love for each other, when there are couples who make perfectly good investments in the community's future who, most of the time, need them in order to make said investments? Living together as one is its own discount, raising a child is just the opposite, whether biological or adopted. These investors are doing a pretty dangerous duty in today's society, what with children suing their parents for groundings and all. They need the help far more than marriage activists.
Those who are paying attention will notice I didn't make any reference to gender in the above paragraph. That would be because, in a perfect world, there wouldn't be. Whether you're a lady raising a family with your husband through the natural methods, or a pair of ladies or a pair of men doing the job a child's biological parents couldn't or wouldn't, you're still doing that same job.
"But you voted against same-sex marriage!" Because we don't live in a perfect world, and right now, same-sex marriage is a buzzword. Sure, they can say they do it to adopt, but right now, we don't need more families willing to adopt. We're already sitting at, at the kindest numbers, FIFTEEN prospective adoptive homes per child, and some estimates raise that all the way to twenty-four per child.
Yes, long post, but that's what you get with difficult questions without easy answers.
TL

R version: I vote in favor of families and children.
(Edit: You might also notice a lack of any talk about moral or religious choices in there. That's because we've got enough practicalities to keep ourselves busy before we get there.)