I am always irritated by the debate about gay marriage. I think that the government shouldn't be involved with marriage at all, so as far as I'm concerned it's a moot point. If some people, gay or straight, want to say that they're married, then go for it. As for tax breaks, I think everyone should have to pay the same amount of tax with no reductions for children, so that (in my opinion) is also inconsequential.
I don't know much about this so there's a good chance I missed some important aspects of it. Anyone who disagrees with me, go ahead and let me know what those are.