IA-1 · House

The district, in brief

Iowa's 1st district is based in the southeastern part of the state and includes the cities of Davenport and Iowa City. The facts record no redraw for this cycle; the lines are the map first used in 2022.

The incumbent is Republican Mariannette Miller-Meeks, in office since 2021, re-elected with 50.0% of the vote in 2024, the narrowest win of any House Republican that year. She won the Republican primary 71.5% to 28.4% over David Pautsch, a ministry founder who ran for the district in 2024. The Democratic nominee is Christina Bohannan, a former state representative from the 85th district (2021–2023) and the party's nominee here in 2022 and 2024, who won her primary 81.5% to 18.5% over Travis Terrell; Bob Krause withdrew and endorsed her. An independent, Michael Bridgford, an independent financial advisor, is also on the ballot. As of June 30, 2026 Miller-Meeks had raised $7,208,271 with $4,691,481 on hand, Bohannan $7,051,745 with $5,425,318 on hand, and Bridgford $189,523 with $124,859 on hand.

The raters split between Flip and Tossup: Decision Desk HQ calls it Flip (September 25, 2026), Sabato's Crystal Ball Flip (September 22, 2026) and Silver Bulletin Flip (August 20, 2026), while Inside Elections (March 7, 2025) and the Cook Political Report (February 6, 2025) have Tossup. Two district polls are recorded: The Bullfinch Group/Independent Center (July 13–16, 2026, 705 likely voters) had Bohannan 40%, Miller-Meeks 35%, Bridgford 11%, 11% undecided; Public Policy Polling, a Democratic firm (June 18–19, 2025, 555 voters), had Bohannan 43%, Miller-Meeks 39%, 18% undecided.

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 Republican primary results box has the winner's name mangled ({{nowrap}}); the 71.5% figure is attributed to Miller-Meeks by position.; The two polls are on Wikipedia but the model's basis says no district polls.; The text gives no presidential result for the district; only the facts carry a presidential baseline.; The Endorsements and Post-primary endorsements sections are empty.; facts.candidates marks no candidate as incumbent; the text does.

Read from the district's section of Wikipedia's state page (CC BY-SA), archived as e7db07292d11; 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

Mariannette Miller-Meeks (Republican), in this chamber since 2021, 3 terms. Committees: House Committee on Energy and Commerce; House Committee on Veterans' Affairs.

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 5.3 points toward the Republicans 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 533,359 adults 25 and over. In 2020 the district voted 48.5% Democratic (two-party) for president. With the same preferences and a 2022-style midterm turnout, it would vote 49.2% Democratic: the midterm electorate alone moves the margin 1.3 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 June 30, 2026; $1,163,892 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 -10.4 to +17.7 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: total outside/party money: 6.2 pts toward the Democrat; outside money balance: 1.2 pts toward the Democrat; asian share (2.3%): 0.7 pts toward the Republican; 2024 presidential lean (R+7.1): 0.6 pts toward the Republican; religion: mainline (13.5%): 0.6 pts toward the Democrat.

How sure is it, and of what?

Total sd 8.51 points, made of the seat's own volatility 89%, correlated polling error 11%. 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 00a09d4b-7980-4ec5-ada0-077968a87242, 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).