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It looks like LD 14 could have a similar pattern to Central Valley California districts where presidential years are much more competitive for Democrats...
I mean that's cause at the end of the day the Yakima valley is a demographic extension of the CA Central Valley, or any other California agricultural region of which the Central Valley is the largest. People came to all of these areas for agricultural work and over time those who stayed built something lasting. You literally said it yourself: like in California turnout plummets quite easily if it's not a presidential year, giving Whites a oversized presence.
The one difference is that this district both geographically and demographically has a noticeable Native presence thanks to the Yakima Nation. To the point where I wouldn't be surprised if some Dem candidates come from that communtiy.