Midterm Forecast2026 · Senate & House
20,000 simulated elections · Model run Oct 28, 12:50 AM ETPolls through Oct 27 · Election Nov 3
Senate / OregonOregon Senate 2026 · seat held by Democrats (incumbent running)

Jeff Merkley is heavily favored to win Oregon

Jeff Merkley>99%Democrat
David Brock Smith<1%Republican
Forecast marginD+26.380%: D+16.0 to D+36.0
Tipping point0.0%chance it decides control
Cook ratingSolid DOct 20
2024 presidentD+14.3nation R+1.5

Polls

Each dot is a poll after adjustment; grey ticks show where it was as published

Dot size shows the weight a poll gets. The line is the model's polling average, with its 80% band. The bar at right is the 80% range of the forecast on election day.

Range of outcomes

Democratic margin across simulations

Jeff Merkley wins in >99% of simulations (about 1 in 2222 for the underdog). Median margin D+26.0.

Chance of winning over time

Daily reruns of the model

Each day is a fresh run of today's model using only the polls that had finished by the day before. Daily runs since Jul 1.

How the forecast is built

Fundamentals D+26.3. Oregon voted D+14.3 for president in 2024, 15.8 points more Democratic than the nation. Add the national generic-ballot margin (D+8.7). Jeff Merkley's incumbency is worth 1.8 points.

No public polls, so the forecast is fundamentals only, with wider uncertainty.

What this race means for control

Because polling errors are correlated, a win here usually comes with wins elsewhere.

Every poll in the model

PollsterField endSamplePublishedHouse effectAdjustedWeight
This race is modeled from a published polling average.