William Saletan, while decrying those who attempt to conflate gay marriage and polygamy, says that both are increasingly approved of and tolerated. Oh and incest too.

We’ve heard this slippery-slope argument before. Five years ago, Republican Sen. Rick Santorum of Pennsylvania put it this way: “If the Supreme Court says that you have the right to consensual sex within your home, then you have the right to bigamy, you have the right to polygamy, you have the right to incest. …”

I hate to say it, but things are playing out pretty much as Santorum predicted.