OR · Senate 2026 · Updated Aug 27, 2026, 2:03 a.m. ET
Oregon
Rated Solid D
Jeff Merkley wins this seat in 99 in 100 simulations. Call it all but certain.
Jeff MerkleyDIncumbent99 in 100
David Brock SmithR1 in 100
Over time
How the forecast has moved
The margin
How close it lands
Each simulation produces a final margin. The curve shows where those margins fall; the tinted areas on either side of even are the futures each party wins.
Under the hood
What's driving the number
The forecast blends a weighted poll average with a fundamentals model: the state's partisan lean, incumbency, the national environment, and fundraising. Positive points favor the Democratic side of the margin; negative favor the Republican side.
- Partisan leanD +14.7
- IncumbencyD +2.5
- National environmentD +5.1
- FundraisingD +1.5
- Fundamentals sayD +23.8
- Blended forecast marginD +23.8
With no usable polling, the forecast rests entirely on the fundamentals.
The markets
What the betting markets say
Prediction markets put a price on this seat too: what people are paying for a contract that pays out if Jeff Merkley wins, read as an implied probability. Shown for comparison only. This is not betting advice, and market prices never feed the model.
- Jeff Merkley winsThis forecast99 in 100
- Jeff Merkley winsKalshi98 in 100
- Jeff Merkley winsPolymarket96 in 100
Market prices as of Aug 27, 2026, 2:03 a.m. ET
The evidence
The polls, as the model sees them
Nobody has polled this race yet, so the forecast leans on the fundamentals above. Polls will show up here as they arrive.
How the weights, the blend, and the simulation work is spelled out on the methodology page.