I got my numbers from AP, so I'm not sure where their data comes from. I believe their website said they estimated that only 60% of the ballots had been counted for I-638 (statewide—King County's was at 54%). But regardless, it still looks very bad, even if there's a lot of uncounted King County voters let to be tallied.

My hope is that if it passes, it is struck down as a violation of the Washington State Constitution, or the Washington Law Against Discrimination by the courts. The Seattle Times has a good article on how that may potentially happen