The law that forces here is the Oregon Equality Act. It prevents businesses from discriminating. It's not a law that legislates gay marriage that's the issue.
A law which says that a gay marriage has to be treated like a straight marriage in one particular way is a gay marriage law. The law is just being made piecemeal and not labelled with "Gay Marriage Law" in the title, but it's still a gay marriage law.
By the same token you could say it's a gun sales law as it forbids people from refusing to sell guns to gay people based on them being gay.
Over at Scott Adams' Blog you can find a very fine example of using the 'Rationality Engine' to solve the social problem of assisted dying.