Wasn't Washington one of the states which enacted a gay marriage ban in 2004? Or was that Oregon? There were 11 or 12 states which enacted such bans by initiative in 2004, and I can't recall if Washington was one of them.
I could see WA or OR (probably both) enacting some sort of civil union statute by the initiative process, however. No doubt that, or a gay marriage initiative, will appear soon, but its way too late for this year's ballot.