I honestly haven't done the research to back up my assumption that the more left-leaning areas west of the Cascades are growing faster than the rest of the stat

I honestly haven't done the research to back up my assumption that the more left-leaning areas west of the Cascades are growing faster than the rest of the state, fueled by migrants from other left-leaning urban areas. It would be interesting to see population trends and voting behavior changes by county over time.