Councilwoman Sawant is a single city councilperson; she isn't a majority of city government (who are mostly pro-business) and definitely isn't representative of the state as a whole, which is pretty purple. Outside of Seattle, especially on the east side of the state but also in some of the smaller metro areas, folks tend to be extremely libertarian. (Not to say there aren't libertarians in Seattle as well, it just skews left of the state average.)

The Seattle metro is a weird microcosm of the state in that it's so vastly bigger than any other metro in the state. Seattle and surrounding metro have about 4 million of the state's 7.5 million residents. So yes, Seattle has a big influence, but it's far from the only voice in Washington.