Updated Oct 16, 2026, 1:45 PM ET
House · 3 November 2026

OH-01 House 2026

92.5% DGreg Landsman leads TruthIndex™Safe D
Polymarket
92.8%
Kalshi
92.1%
Spread
0.7 pts
24h
–
7 days
+5.2
Updated
Oct 16, 2026, 1:45 PM ET
Latest coverage

Live News

Recent coverage for OH-01 House.

  1. Ohio data center legislation drew hordes of lobbyists

    The article notes political activity around Ohio’s 1st Congressional District (OH-01) involving Rep. Greg Landsman (D) and Republican challenger Eric Conroy.

    signalohio.orgLandsmanMerrinConroy
  2. Political Money Wire: New Spending in Alaska and Eight Other Races

    Topic: Political spending in Colorado’s 5th District (CO-05) as part of the broader report “Political Money Wire: New Spending in Alaska and Eight Other Races.”

  3. Dems Threaten Forced Vote to Censure Rep. Randy Fine Over Controversial Comments (2026)

    Greg Landsman (D-Ohio) is cited as opposing a forced censure vote against Rep. Randy Fine over controversial anti-Muslim remarks.

    sotvl.orgLandsman
  4. Republicans Pull Back Funding in Battleground Districts, Shaking Up Midterm Spending

    The article notes that the Congressional Leadership Fund halted campaign spending in two battleground districts, including Ohio’s 1st District where Republican Eric Conroy is challenging Democratic Rep. Greg Landsman.

    americanlibertypac.comLandsmanConroy
  5. Landsman, Conroy compete for Mason-area House seat Nov. 3

    The article covers the race for Ohio’s redrawn 1st Congressional District (covers Warren County, Clinton County, and parts of Hamilton County) between incumbent Democrat Greg Landsman and Republican challenger Eric…

    masondeerfieldtimes.comLandsmanConroyDiLorenzo

Greg Landsman, last 60 days

How to read this chart

The green line is the TruthIndex™, the chance of this outcome. It combines the prices on both venues and gives more weight to the venue with more money in its order book. The two thinner lines are Polymarket's and Kalshi's own prices, and the grey band between them shows how far apart the two venues are.

The pale bands behind the lines are the rating zones (Toss-up, Lean, Likely and Safe), so you can see when the race moved from one rating to another. Move along the chart, or use the arrow keys, to read the values for each day.

More in Methodology
TruthIndex™PolymarketKalshiGap between the venuesRating zones

All outcomes

OutcomeTruthIndex™PolymarketKalshiSpread24h
DGreg Landsman 92.5% 92.8% 92.1% 0.7 pts –
REric Conroy 7.2% 7.3% 7.2% 0.1 pts –

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Candidates & Background

Eric Conroy

Republican

Eric Conroy, a U.S. Air Force veteran and former CIA officer, is the Republican nominee for Ohio's 1st congressional district in 2026, challenging Democratic incumbent Greg Landsman in the November general election.

Greg Landsman

Greg Landsman

Democratic U.S. Representative for Ohio's 1st congressional district (since 2023)

Greg Landsman, a Democrat who has represented Ohio's 1st congressional district since 2023 and previously served on the Cincinnati City Council, faces Republican Eric Conroy, an Air Force veteran and former CIA officer, in 2026.

Born 1976 · Cincinnati, Ohio

Margin of victory

Each venue's margin market, shown on its own: the two venues set their ranges differently.

Kalshi3.9K contracts

Ohio's 1st District margin of victory

Conroy, 1+ pts
8.5%
Conroy, 4+ pts
8.6%
Source: Kalshi market

Kalshi577 contracts

Ohio's 1st District margin of victory

Landsman, 1+ pts
90.1%
Landsman, 2+ pts
81.5%
Landsman, 5+ pts
70.5%
Landsman, 8+ pts
56.5%
Landsman, 11+ pts
41.5%
Landsman, 14+ pts
28.5%
Landsman, 17+ pts
17.5%
Landsman, 20+ pts
8.8%
Source: Kalshi market

Polymarket$19.8K traded

OH-01 House Election Margin of Victory

Republican 3%+
1.6%
Republican 0-3%
4.0%
Democrat 0-3%
5.3%
Democrat 3-6%
12.0%
Democrat 6-9%
17.3%
Democrat 9-12%
17.5%
Democrat 12-15%
14.1%
Democrat 15-18%
10.5%
Democrat 18-21%
13.0%
Democrat 21%+
9.5%
Source: Polymarket market

Each venue's market

Polymarket$52.2K traded

Prices which party wins.

Greg Landsman: Counted · bid 91.7% / ask 93.9% · $2.4K within 5 pts

This market will resolve according to the party of the candidate who wins the OH-01 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026. ​​A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time all of the 2026 House elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican parties will be considered a member of one of these parties based on the party with which they most recently expressed their intent to caucus at the time all of the House elections are conclusively called by this market's resolution sources. This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the United States government, specifically the Federal Election Commission (https://www.fec.gov/).

Full rules on Polymarket

Kalshi94.4K contracts traded

Prices which party wins.

Greg Landsman: Counted · bid 92.0% / ask 92.1% · $1.9K within 5 pts

Contract shown: Greg Landsman

If the House member sworn in for OH-01 for the term beginning in 2027 is a member of the Democratic Party, then the market resolves to Yes.

This market is eligible for accelerated determination after a consensus of media organizations project the winner. See full rules for details.

Full rules on Kalshi