Washington uses non-partisan "primaries," meaning that the top two vote-getters will be on the ballot in November, regardless of party. In a lot of cases, these results are suggestive of November, though there's one mentioned in the Seattle Times article where the general election ballot may be a choice between two Democrats. I haven't looked at the rest of the state, but I'd be unsurprised to learn there are districts where the November choice will be between two Republicans.

(This always seemed odd when I was living there, since I'd spent the first forty-odd years of my life in New York, where each party has its own primary. New York's system is weird in its own ways, which this margin is too small to explain.)