WA still or used to have residual Asian-American voters that tend to vote republican. Those voters have largely abandoned the Republican party, I suspect further erosion with growing anti-Asian racism fueled by Trump's rhetoric. A similar pattern could be seen in Orange County, CA Vietnamese precincts as Vietnamese-American voters swing further to the Democrats.
The shift began under President Bill Clinton, who made a deliberate effort to court the Asian-American political community. The first sign this was bearing fruit was in 1996. Clinton narrowly lost the Asian-American vote to Bob Dole 44%-48%, a significant improvement over the 31%-55% gap in 1992. In 2000, Gore won Asians 55%-41%. The gap has only grown in the years since.
