I've written before that I find arguments both for and against same-sex marriage to be about equally inane. That leaves me, net-net, against codifying the practice into law, because as a conservative I favor a millennia-old tradition over a newfangled idea unless significant evidence can persuade me otherwise.
National Review's recent editorial "The Case For Marriage" is the best argument I've read to date bolstering my default position. Is there a similarly persuasive case in favor of same-sex marriage? If so, I haven't read it - and as I've said, it would have to be even more persuasive to swing me against tradition.