Incumbent Democrat Rick Larsen advanced from the August 2026 top-two primary with 44.9% against Republican Edwin Feller’s 32.9%, setting up a general election matchup in a district with a D+12 partisan lean. All major forecasters rate the race Solid or Safe Democratic, reflecting Larsen’s long tenure and the district’s consistent support for Democratic presidential candidates. Trader consensus on narrow margin bands and Republican win probabilities near 38% appears driven by uncertainty over turnout patterns in a low-profile contest and the absence of recent public polling. Key variables that could shift probabilities include national political conditions closer to November 3, mail-ballot volume, and any late campaign spending or endorsements that alter baseline expectations for Larsen’s typical performance.