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

NY-21 House 2026

75.1% RAnthony Constantino leads TruthIndex™Likely R
Polymarket
74.5%
Kalshi
75.5%
Spread
1.0 pts
24h
–
7 days
+3.1
Updated
Oct 16, 2026, 1:45 PM ET
Latest coverage

Live News

Recent coverage for NY-21 House.

  1. Gendebien releases new ad, pushes for Trump voter support

    WATERTOWN, New York (WWNY) - With election day now less than three weeks away, The Democratic candidate for New York’s 21st congressional district is pushing hard for disaffected supporters of President Trump to vote…

  2. Lawler's Dem opponent Cait Conley throws Hochul under the bus in jaw-dropping public burn

    Cait Conley delivered the jaw-dropping burn this week, becoming the second Democratic congressional candidate to publicly distance themselves from Hochul ahead of next month’s midterms.

    New York PostConleyGendebien
  3. Voters react to latest in NY-21 race

    Republican Anthony Constantino (left) and Democrat Blake Gendebien

  4. Exclusive | Dem running for Stefanik's seat won't endorse Hochul in embarrassing snub

    State Democratic Party chairman Jay Jacobs, a top Hochul ally, gave Gendebien a pass for not publicly backing the governor. He said Gendebien needs to attract Republican votes to pull off an upset.

  5. Democrats keep expanding their battleground map. History suggests it’s a mirage

    Florida’s 27th District, Eliott Rodriguez: Rodriguez is known to millions as a former local news anchor. He is up against Rep. Maria Elvira Salazar (R-FL), who has distanced herself from Trump’s deportation policies.

Anthony Constantino, 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
RAnthony Constantino 75.1% 74.5% 75.5% 1.0 pts –
DBlake Gendebien 24.9% 24.5% 25.5% 1.0 pts –

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<p style="margin:4px 0 0;font:12px/1.4 Arial,sans-serif">Live odds: <a href="https://midterms.nijinn.io/house/ny-21/?utm_source=embed&amp;utm_medium=embed-credit&amp;utm_campaign=midterms-2026&amp;utm_content=house-ny-21">Nijinn US Midterms 2026</a></p>

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Candidates & Background

Anthony Constantino

Republican

Anthony Constantino, a Republican businessman, is his party's nominee for the open seat in New York's 21st congressional district in 2026 against Democratic dairy farmer Blake Gendebien.

Blake Gendebien

Democratic

Blake Gendebien, a Democratic dairy farmer, is his party's nominee for the open seat in New York's 21st congressional district in 2026 against Republican businessman Anthony Constantino.

Margin of victory

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

Kalshi5.5K contracts

New York's 21st District margin of victory

Constantino, 1+ pts
74.0%
Constantino, 3+ pts
67.0%
Constantino, 6+ pts
51.0%
Constantino, 9+ pts
32.0%
implied
Constantino, 12+ pts
19.5%
Constantino, 15+ pts
12.8%
Constantino, 18+ pts
6.5%
Constantino, 21+ pts
4.5%
Constantino, 24+ pts
5.5%
implied
Source: Kalshi market

Polymarket$8.0K traded

NY-21 House Election Margin of Victory

Republican 21%+
4.5%
Republican 18-21%
1.4%
Republican 15-18%
1.4%
Republican 12-15%
2.8%
Republican 9-12%
3.8%
Republican 6-9%
23.5%
Republican 3-6%
21.0%
Republican 0-3%
17.5%
Democrat 0-3%
15.5%
Democrat 3%+
13.5%
Source: Polymarket market

Each venue's market

Polymarket$97.4K traded

Prices which party wins.

Anthony Constantino: Counted · bid 74.0% / ask 75.0% · $26.0K within 5 pts

This market will resolve according to the party of the candidate who wins the NY-21 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

Kalshi147.0K contracts traded

Prices which party wins.

Anthony Constantino: Counted · bid 75.0% / ask 76.0% · $38.0K within 5 pts

Contract shown: Anthony Constantino

If the House member sworn in for NY-21 for the term beginning in 2027 is a member of the Republican 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