Incumbent Democrat Suzan DelBene faces Republican Mary Silva in Washington's 1st congressional district on November 3, with the seat rated solid Democratic by major forecasters. DelBene's comfortable top-two primary performance, substantial fundraising advantage, and the district's consistent Democratic lean from recent presidential results underpin trader views that a Republican victory remains unlikely. The spread of probabilities across Democrat margin buckets reflects uncertainty over turnout patterns, national political conditions, and any late voter shifts that could widen or narrow the final result. Historical base rates and the absence of major campaign-altering events in recent weeks have kept expectations for the exact victory margin distributed rather than concentrated in any single range.