WA-4 · House

The district, in brief

Washington's 4th district encompasses much of central Washington, including Yakima and the Tri-Cities of Kennewick, Pasco, and Richland. It is on the map first used in 2022 and is not redrawn for 2026; the facts carry no presidential baseline for these lines.

The seat is open: the incumbent, Republican Dan Newhouse, who was re-elected with 52.0% of the vote against another Republican in 2024, declined to run. The facts record Republicans holding the seat every cycle since 2012, with a two-party margin of -36.1 for the Democrat in 2022. The Republican nominee is Amanda McKinney, Yakima County commissioner since 2020; the Democratic nominee is John Duresky, a combat veteran, retired Air Force Major and project manager. In the blanket primary McKinney took 34.8% and Duresky 29.9%; Republicans Jerrod Sessler, the 2024 runner-up, and state senator Matt Boehnke took 14.6% and 10.5% and were eliminated with seven others. As of June 30, 2026 McKinney had raised $928,595 with $443,613 on hand; Duresky had raised $81,606 with $57,084 on hand.

Every rater listed calls the seat R: Decision Desk HQ (September 8, 2026), the Cook Political Report (February 6, 2025), Inside Elections (March 7, 2025), Sabato's Crystal Ball (August 14, 2025) and Split Ticket (July 28, 2026). The only poll recorded is a primary poll by Fabrizio, Lee & Associates, a Republican firm (February 4–5, 2026), with Duresky 25%, McKinney 20%, Sessler 14% and 27% undecided; no general-election poll is recorded.

A paragraph quoting a model forecast from the day this brief was written is omitted; the current forecast is at the top of this page.

The facts, each beside its sentence

Not in the source: The text gives no presidential result for the district and the facts have no presidential baseline.; No general-election poll appears in the text; the only poll is a February 2026 primary poll, and the model's basis says no district polls.; The facts mark the 2024 result as unopposed with no two-party margin, while the text says Newhouse won against another Republican; the 2024 margin is therefore not stated.; No ratings finer than 'R' are given (no Lean/Likely/Safe).; The endorsements section is empty.

Read from the district's section of Wikipedia's state page (CC BY-SA), archived as 77b3209be57f; written by claude-fable-5-1 (batch reader) on 2026-09-30 and checked mechanically: every quote occurs verbatim in the archived text, every number in the brief occurs in the inputs. No probability here is the reader's.

Who holds the seat now

Dan Newhouse (Republican), in this chamber since 2015, 6 terms. Committees: House Committee on Agriculture; House Committee on Appropriations; House Select Committee on the Strategic Competition Between the United States and the Chinese Communist Party.

From the congress-legislators dataset (CC0), archived as ae8cb9477c48. For a Senate race this lists both of the state's senators; the one whose term ends in the election year holds the seat on the ballot. For a House district redrawn for 2026 it is the member elected under the old lines with this number, who may be running elsewhere; the dossier above names who is running here.

How it has voted for president

A shift of 2.2 points toward the Democrats from 2016 to 2024. county returns placed on the current lines by 2020 block population; MEDSL county file (2016), an MIT-licensed county file (2020, checked against certified state results) and MEDSL precinct returns (2024). For a district split across counties this is an estimate, and where the state published the exact 2024 figure for these lines, that exact figure is the one the model uses.

Who are the voters?

Of about 482,968 adults 25 and over. In 2020 the district voted 41.3% Democratic (two-party) for president. With the same preferences and a 2022-style midterm turnout, it would vote 42.1% Democratic: the midterm electorate alone moves the margin 1.7 points toward Democrats. Group shares are estimated from how results vary across the state's census tracts (ecological inference, anchored to Pew's 2020 validated-voter figures) and calibrated to this district's actual 2020 vote; turnout is the Census survey's state rate by race and national rate by education, whose state samples carry margins of several points.

Not answered here: how each group will vote in 2026. These are 2020 preferences; this profile is description, not yet an input to the forecast.

The money

FEC bulk candidate summaries through August 18, 2026; $2,262,373 of independent expenditures for or against these candidates this cycle (FEC Schedule E, types 24E and 24A), which is the parties' and outside groups' own revealed view of whether this seat is in play.

The district in numbers

ACS 5-year 2023, the Census Bureau's own tabulation of this district (118th Congress lines). Unemployment is the BLS county series placed on the district by block population, not seasonally adjusted, so changes are same-month comparisons. Income, transfers and jobs are BEA county accounts placed the same way, compared with the average district. Every other figure is a named column of a named table in the Bureau's summary file, archived before it was read. This is what a reader knows about a district before looking at a poll; the model does not yet use it, and whether it should is a registered question.

Who is favoured, and by how much?

The 90% interval runs from -25.9 to +4.0 points, D-R. It is wide because this district has never been polled.

What is this built on?

A model trained on every contested House race 2012-2024 predicts this district's lean from its own record: presidential and House results on the current lines, incumbency, both candidates' prior offices, outside and party money before 1 October, demographics and public-assistance shares from the Census release before the election, local unemployment and income, and religious tradition. The national margin comes from presidential approval, the economy, the midterm penalty and the generic ballot corrected for its measured lean. Draws share national and state errors, so the seat total and this district come from the same simulation.

Not answered here: district polls, which are not yet folded in.

Why does the model say this?

Each figure is how far this district's predicted lean moves when that one feature is set to the typical value across 2026 districts, everything else held: 2024 presidential lean (R+20.1): 13.1 pts toward the Republican; 2024 House lean: 2.9 pts toward the Republican; total outside/party money: 1.9 pts toward the Democrat; asian share (1.6%): 1.0 pts toward the Republican; outside money balance: 0.9 pts toward the Democrat.

How sure is it, and of what?

Total sd 9.07 points, made of the seat's own volatility 91%, correlated polling error 9%. The decomposition is stored with the forecast rather than reconstructed, so a probability whose dominant input is a placeholder is visibly that.

Not answered here: a nowcast. 'If ballots were cast today' needs something that observes today, and for a House district nothing does. Publishing the election-day figure under both labels would make one forecast look like two.

How was this number made?

Run 6f211e6f-2bdc-4dda-8f72-81fc628dab0b, house_district_prior/0.2.0, as of 2026-10-02. Promoted by a pre-registered gate: on 2016-2022 its Brier score was 0.036 against 0.049 for the previous method, and on a single 2024 run 0.023 against 0.032 (experiments/district_gate_result.md, with an independent review).