I was a strong opponent of same-sex marriage. Fourteen years ago, Andrew Sullivan and I forcefully debated the issue at length online (at a time when online debate was a brand new thing). Yet I find myself strangely untroubled by New York state's vote to authorize same-sex marriage -- a vote that probably signals that most of "blue" states will follow within the next 10 years. I don't think I'm alone in my reaction either. Most conservatives have reacted with calm -- if not outright approval -- to New York's dramatic decision. Why? The short answer is that the case...