Seattle out votes the rest of the state even if they don't have enough votes.
In close races, you are correct.
My colleague on rail issues, a "Scoop Jackson" Democrat who is supporting McCain, said, "The King County Democratic machine has this pool of dead people they vote in close elections. It won't work when the race is a blowout, but in something like the Rossi-Gregoire business, those votes can swing an election."
My colleague ran for office twice in King County as a Democrat, but the latte-sipping leftists beat him handily. Incidentally, he is a personal friend of McCain and worked with him on national park issues, even spending a day at the house with John and Cindy. So I think it's significant that he believes Obama is worthless.