Short Answer

Cory Booker is expected to win the New Jersey Senate seat in 2026, with the market pricing this outcome at 98.1%.

1. Market Behavior & Drivers

This market's low probability for a Republican victory reflects the general election dynamic in which incumbent Democrat Cory Booker is considered heavily favored against Republican nominee Justin Murphy. The price decline from 2.0% to 0.2% between late August and early September does not coincide with any specific development in the provided context. Instead, it appears to be a final pricing-out of the challenger's chances as the market consensus solidifies around the incumbent's structural advantages.
The market has maintained this near-zero probability since early September. The total volume of 4,615 contracts is distributed over the market's history, but the sample data shows zero volume on the days of the most significant price drops. This suggests the move may have occurred in a low-liquidity environment, with the price adjusting to reflect the baseline political situation in New Jersey rather than reacting to a specific news-driven event.
  • Since last update (~28d): Cory Booker's model probability increased by +1.8pp, driven by model-led conviction widening the edge.
  • Justin Murphy's model and market probabilities decreased by -1.8pp, tracking market consensus.
  • Overall confidence in the prediction increased by +4.0pp, now scoring 9.0.
  • Cory Booker appears likely to win, supported by a significant fundraising lead.
  • Non-partisan forecasters unanimously project Booker to win, rating the race 'Solid D'.

Who Wins and Why

Outcome Market Model Why
Justin Murphy 0.2% 0.2% Justin Murphy faces an improbable path given the incumbent's fundraising lead and New Jersey's strong Democratic lean.
Cory Booker 98.1% 99.8% Incumbent Cory Booker holds an overwhelming advantage with a significant fundraising lead and New Jersey's strong Democratic lean.

Current Context

Incumbent Cory Booker is heavily favored in the 2026 New Jersey Senate race. The 2026 United States Senate election in New Jersey will be held on November 3, 2026 [1]. Incumbent Democratic Senator Cory Booker will face Republican nominee Justin Murphy, who secured his party's nomination on June 2, 2026 [1][2][3][4]. As of September 9, 2026, the general election has not yet taken place [3][5][6][4]. The voter registration deadline for New Jersey is October 13, 2026 [7][8][9].
Forecast models assign Booker a high probability of victory. Prediction markets and expert analyses overwhelmingly favor Senator Booker to win his third full term [5][10][11]. Forecast models and betting markets indicate a 96-98% probability of victory for Booker [5][10]. The Cook Political Report rates the race as "Solid Democrat" [11]. Decision Desk HQ (DDHQ) categorizes the contest as "Safe Democratic," with Booker holding a 96% probability of winning as of September 7, 2026 [5][4].
Recent controversies and campaign finance favor Booker. Republican nominee Justin Murphy recently drew controversy for remarks made at a forum, which Senator Booker publicly condemned as "vile" [12]. Booker maintains a substantial campaign finance advantage, with over $23 million in his account as of mid-2026 [10].
Sources (12)
  1. 12026 United States Senate election in New Jerseyen.wikipedia.org
  2. 2Justin Murphy will face Cory Booker in November after winning the Republican primary. - Total Newstotalnews.com
  3. 32026 New Jersey US Senate | Live Election Resultsvotes.decisiondeskhq.com
  4. 42026 New Jersey US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com
  5. 52026 New Jersey US Senate Forecast | DDHQvotes.decisiondeskhq.com
  6. 62026 New Jersey US Senate Live Election Results | DDHQnewsnation-votes.decisiondeskhq.com
  7. 72026 General Election Timelinenj.gov
  8. 8NJ DOS - Division of Elections - 2026 Election Information and Resultsnj.gov
  9. 92026 election and voting dates - Ballotpediaballotpedia.org
  10. 102026 New Jersey Senate Winner by Party | Polls & Oddspredictionedge.com
  11. 112026 CPR Senate Race ratings - Cook Political Reportcookpolitical.com
  12. 12Republican NJ Senate nominee bashes Islam at forum, Cory Booker calls remarks ‘vile’ | The Politic Reviewthepoliticreview.com

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

This market resolves YES if the Democratic party candidate, Cory Booker, wins the New Jersey Senate race. It resolves NO if the Republican party candidate, Justin Murphy, wins. The race is scheduled for November 3, 8:00am EST, and the market resolves based on the winning party, with a maximum payout date of November 3, 2027.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Cory Booker $0.98 $0.03 98%
Justin Murphy $0.03 $1.00 0%

Market Discussion

The 2026 U.S. Senate election in New Jersey, scheduled for November 3, 2026, features Democratic incumbent Cory Booker against Republican nominee Justin Murphy, who secured his party's nomination on June 2, 2026 [1][2][3][4][5][6][7]. Prediction markets and forecasters overwhelmingly favor Booker, with implied probabilities consistently above 90-95% as of August and September 2026, and Decision Desk HQ assigning him a 96% win probability as of September 7, 2026 [8][9][10][11][7]. Earlier periods of volatility in these markets were attributed to thin liquidity and low trading volume rather than fundamental shifts in electoral prospects [9][11].

Sources (11)
  1. 12026 United States Senate election in New Jersey - Wikipediaen.wikipedia.org
  2. 2New Jersey Senate Primary Election 2026 Live Resultsnbcnews.com
  3. 3NJ election 2026: Murphy wins Senate primary, will face Booker in...whyy.org
  4. 4New Jersey Senate primary results: GOP's Justin Murphy will face incumbent Democrat Cory Bookernewsnationnow.com
  5. 52026 New Jersey US Senate | Live Election Resultsvotes.decisiondeskhq.com
  6. 6United States Senate election in New Jersey, 2026 - Ballotpediaballotpedia.org
  7. 72026 New Jersey US Senate Forecastvotes.decisiondeskhq.com
  8. 8https://polymarket.com/event/new-jersey-senate-election-winner?r=predictionhunteventspolymarket.com
  9. 9Booker Favored to Hold NJ Senate Seat as Market Splits 93% vs. 5% | Prediction Huntpredictionhunt.com
  10. 10Why Cory Booker Will Win the New Jersey Senate Race: Kalshi | OddsShopperoddsshopper.com
  11. 11Republican NJ Senate Odds Collapse to 5% After 46pp Drop in 3 Days | Prediction Huntpredictionhunt.com

4. Trust Index

Octagon Trust Index Kalshi 75 Good

Order book is critically thin.

Primary risk· Trade quality

How it adds up
Integrity80% of score82Good
Trade quality20% of score45High Risk

Includes the cost to trade: a $1,000 order can't be filled here because the order book is too thin.

Trust score75Good

Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index

Trust profile
Integrity4 screens run · 6 don't apply
Market integrity
77Good

Outcome is hard to influence

Large tradesTrade signals · medium confidence

Largest single print on SENATENJ-26-R carried 49% of its $176 tape (contract holds 8.4% of the event's money; print is 26d old)

Screened clean
Thin-volume movesNo significant move Clear
Size patternsNo distribution read Clear
2 screens not run
Outcome control · doesn't apply to this market type
Thin-leg conviction · doesn't apply to this market type
Info fairness
80Good

Structural prior — no screens apply

No suspicious activity on any screen

Screened clean
Information exposureNo concentrated group can know the outcome materially early. Clear
4 screens not run
Move vs. catalyst · doesn't apply to this market type
Longshot repricing · doesn't apply to this market type
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · doesn't apply to this market type
Resolution quality
92Strong

Resolution mechanism is dependable

No suspicious activity on any screen

Resolution rules read: Clear

Liquidity
57Thin

Expect slippage beyond small size

2 contracts · worst first

Justin Murphy48
Thin · low confidence

Light recent trading — size may not fill near the screen price.

Cory Booker58
Thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
70Stable

No significant moves

2 contracts · worst first

Cory Booker—
No significant move (3d)

Price was stable over the last 3 days.

Justin Murphy—
No significant move (24h)

Price was stable over the last 24 hours.

Rule clarity
100Clear

Counts toward Resolution quality, not here

2 contracts · worst first

Cory Booker100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Justin Murphy100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
45High Risk

Order book is critically thin

Tradable, but expect execution cost beyond small sizes.

Outcome quality 57 (notional-weighted across 2 scored legs)

$100 order: 0.2c slippage (~10% of a 2c contract)

$1,000 order: book too thin to fill

$10,000 order: book too thin to fill

Cory Booker58Market scoreLiquidity58Move quality–Rule clarity100
Why 58
Liquidity
58 · Thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Justin Murphy48Market scoreLiquidity48Move quality–Rule clarity100
Why 48
Liquidity
48 · Thin · low confidence

Light recent trading — size may not fill near the screen price.

Move quality
No significant move (24h)

Price was stable over the last 24 hours.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 26, 2026

5. How do Cory Booker and Justin Murphy compare on key policy issues for New Jersey voters in 2026?

Cory Booker's Policy FocusHousing and economic support for low- and middle-income earners [1][2]
Justin Murphy's Policy FocusConservative fiscal principles and market-based healthcare reform [1][2]
Information AvailabilityLimited information on Justin Murphy's specific policy positions compared to Cory Booker [3]
Cory Booker and Justin Murphy offer distinct policy platforms for 2026. Booker prioritizes housing and economic support for low- and middle-income earners, while Murphy emphasizes conservative fiscal principles and market-based healthcare reform [1][2]. There is, however, limited detailed information available regarding Justin Murphy's specific policy positions compared to the incumbent, Cory Booker [3].
Senator Cory Booker's platform centers on his established record. His key policy areas include addressing housing issues, opposing specific immigrant detention facilities, and implementing economic policies aimed at supporting low- and middle-income individuals through tax deductions [1][2]. His platform is built on his record as a long-term senator and his past critiques of the previous administration [1][2].
Justin Murphy advocates for conservative fiscal policies and market-driven healthcare. His platform includes advocating for tax cuts, reductions in spending, and fostering private sector growth [1][2]. He also supports healthcare reform that promotes competition and the use of Health Savings Accounts, steering away from government-run systems [1][2]. Ballotpedia's 2026 Candidate Connection survey does not yet list completion by Murphy, which contributes to the limited detail on his specific policy stances compared to Booker [3].
Sources (3)
  1. 1NJ election 2026: Murphy wins Senate primary, will face Booker in...whyy.org
  2. 22026 Election: U.S. Senate - NJ Spotlight Newsnjspotlightnews.org
  3. 3Justin Murphy - Ballotpediaballotpedia.org

6. How do polling aggregates from sources like FiveThirtyEight and RealClearPolitics track the Booker vs. Murphy race throughout 2026?

Booker Win Probability (Prediction Markets)94% to 98% (early September 2026) [1]
Race Classification (Decision Desk HQ)Safe Democratic (as of September 9, 2026) [2][3]
IncumbentCory Booker [4][5][6]
The 2026 New Jersey Senate race is largely considered non-competitive. The U.S. Senate election in New Jersey, featuring incumbent Democrat Cory Booker and Republican challenger Justin Murphy, is widely assessed as a non-competitive contest [2][3][4][5][6]. This leads to a noted absence of widespread polling aggregates from major organizations tracking the race, as analysts and prediction markets classify the New Jersey Senate seat as a safe Democratic hold [2][3][7].
New Jersey's political landscape and Booker's resources explain this classification. This assessment is primarily attributed to the state's political demographics and Booker's significant fundraising advantage [7][8][9][10]. As of early September 2026, prediction markets overwhelmingly favor Cory Booker, with probabilities for his reelection generally ranging from 94% to 98% [1]. Specifically, Decision Desk HQ, as of September 9, 2026, forecasts Booker with a 96% probability of winning, reinforcing the "Safe Democratic" characterization of the race [2][3].
Sources (10)
  1. 1New Jersey US Senate Winner — Compare Odds on 5 Platforms | CoinRithmcoinrithm.com
  2. 22026 New Jersey US Senate Forecast | DDHQvotes.decisiondeskhq.com
  3. 32026 New Jersey US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com
  4. 4Justin Murphy wins N.J. Republican primary for chance to face Cory...phillyvoice.com
  5. 52026 New Jersey US Senate | Live Election Resultsvotes.decisiondeskhq.com
  6. 6Justin Murphy - Ballotpediaballotpedia.org
  7. 72026 New Jersey Senate - Murphy vs. Booker | RealClearPollingrealclearpolling.com
  8. 82026 New Jersey Senate Forecast | Election Odds & Latest Pollspollsmax.com
  9. 9New Jersey's Senate Election - VoteHubvotehub.com
  10. 102026 New Jersey Elections, Odds & Candidates | Prediction Edgepredictionedge.com

7. What potential campaign developments or national events could materially shift Justin Murphy's polling numbers before November 3, 2026?

Justin Murphy Campaign Receipts$39,344 (as of June 30, 2026) [1]
Cory Booker Campaign Receiptsover $33.5 million (as of June 30, 2026) [2]
Cory Booker Win Probability96% (as of September 9, 2026) [3]
Justin Murphy's polling is unlikely to shift significantly before November 2026. The U.S. Senate election in New Jersey, scheduled for November 3, 2026, is widely considered non-competitive, with incumbent Cory Booker maintaining a substantial lead over Republican nominee Justin Murphy [4][5][6][3]. A material shift in Murphy's polling numbers is highly improbable without a major, unprecedented scandal or unforeseen event impacting the race [4][5][6].
Murphy faces significant structural and financial disadvantages in the race. He contends with limited name recognition in state politics and a lack of significant campaign funds, emerging from a fractured Republican primary [4][5][6]. As of June 30, 2026, Murphy's total campaign receipts were approximately $39,344 [1][2], starkly contrasted by incumbent Cory Booker's over $33.5 million [3]. Booker benefits from superior fundraising, established name recognition, and robust structural party support within New Jersey, a heavily Democratic state that has not elected a Republican senator since 1972 [4][5][6].
Polling analysts project a highly probable victory for incumbent Cory Booker. As of September 9, 2026, Decision Desk HQ forecasts Cory Booker with a 96% probability of winning the election, while Justin Murphy holds a 4% probability [3]. The projected margin for the New Jersey U.S. Senate race is D+18, classifying the contest as 'Safe Democratic' [3].
Sources (6)
  1. 1Justin Murphy - Ballotpediaballotpedia.org
  2. 2THE COMMITTEE TO ELECT JUSTIN MURPHY 2024 - committee overview | FECfec.gov
  3. 32026 New Jersey US Senate Forecast | DDHQvotes.decisiondeskhq.com
  4. 4A Republican with no cash wins nomination to go against... - Politicopolitico.com
  5. 5Booker Favored to Hold NJ Senate Seat as Market Splits 93% vs. 5% | Prediction Huntpredictionhunt.com
  6. 6Republican NJ Senate Odds Collapse to 5% After 46pp Drop in 3 Days | Prediction Huntpredictionhunt.com

8. What do the latest FEC filings show for the fundraising and cash-on-hand totals for the Booker and Murphy campaigns?

Cory Booker Funds Raised$33,504,255 (July 2026 FEC filing) [1]
Cory Booker Cash-on-Hand$23,060,940.12 (July 2026 FEC filing) [1]
Cory Booker Win Probability94%-98% (Prediction Markets, September 2026) [2]
Senator Cory Booker demonstrates a strong financial position for his 2026 Senate campaign. As of the July 2026 quarterly FEC filing, covering the period that ended June 30, 2026, the incumbent has raised $33,504,255 for his New Jersey Senate campaign [1]. His campaign maintains an ending cash-on-hand balance of $23,060,940.12 [1].
Forecasts consistently indicate high win probabilities for Senator Booker. Prediction markets, as of September 2026, show market-implied win probabilities ranging between 94% and 98% for Booker to win the 2026 New Jersey Senate election [2]. Decision Desk HQ forecasts Cory Booker with a 96% win probability, categorizing the race as Safe Democratic [1].
Fundraising data for a "Murphy" campaign appears for a candidate not actively running. While Justin Murphy has reported raising $39,344 with a cash-on-hand balance of $122 for his 2026 campaign, official records do not show an active "Murphy" campaign for the 2026 U.S. Senate election [1]. Additionally, George Helmy is not a candidate [1].
Sources (2)
  1. 12026 New Jersey US Senate Forecastvotes.decisiondeskhq.com
  2. 2New Jersey Senate Race 2026: Live Election Odds - Exchange Alphaexchangealpha.com

9. What data from non-partisan forecasters like the Cook Political Report and Decision Desk HQ underpins Cory Booker's overwhelming odds to win in 2026?

Cook Political Report RatingSolid D (as of September 2026) [1][2][3]
Decision Desk HQ Win Probability96% for Cory Booker (as of September 9, 2026) [4][3][5][6]
Cory Booker Campaign Funds RaisedOver $33.5 million (through June 30, 2026) [5][6][7]
Non-partisan forecasters overwhelmingly predict Cory Booker will win the 2026 New Jersey Senate race. The Cook Political Report, as of September 2026, rates the contest as 'Solid D' (Solid Democrat) [1][2]. Similarly, Decision Desk HQ classifies the race as 'Safe D' (Safe Democrat), projecting a 96% win probability for incumbent Cory Booker as of September 9, 2026 [3][4][5][6]. These strong predictions reflect New Jersey's consistent Democratic lean and the significant advantages of incumbency [5][6].
Forecast models rely on fundamental factors and market indicators to predict outcomes. The methodology underpinning these forecasts typically incorporates 75% fundamentals and 25% market indicators, with fundamentals encompassing partisan baseline, incumbency, presidential party cycle effects, and campaign financial advantage [5][6]. Factors specifically favoring Booker include his unopposed Democratic primary and New Jersey's long-standing Democratic voting record, which has not seen a Republican senator elected since 1972 [8][9]. Additionally, the Republican challenger's win in a fractured primary further contributes to Booker's strong position [8][9]. Federal Election Commission data through June 30, 2026, also highlights Booker's substantial financial lead, showing over $33.5 million raised compared to his opponent, Justin Murphy, who raised $39,344 [5][6][7].
Sources (9)
  1. 1NJ Senate 2026 - Cook Political Reportcookpolitical.com
  2. 22026 CPR Senate Race ratings - Cook Political Reportcookpolitical.com
  3. 32026 United States Senate election in New Jersey - Wikipediaen.wikipedia.org
  4. 42026 U.S. Senate Forecast - DDHQ Votes - Decision Desk HQvotes.decisiondeskhq.com
  5. 52026 New Jersey US Senate Forecast | DDHQvotes.decisiondeskhq.com
  6. 62026 New Jersey US Senate Forecast | DDHQnewsnation-votes.decisiondeskhq.com
  7. 7CORY BOOKER FOR SENATE - committee overview | FECfec.gov
  8. 8Booker Favored to Hold NJ Senate Seat as Market Splits 93% vs. 5% | Prediction Huntpredictionhunt.com
  9. 92026 New Jersey Elections, Odds & Candidates | Prediction Edgepredictionedge.com

10. What Could Change the Odds

Key Catalysts

The 2026 United States Senate election in New Jersey features incumbent Democratic Senator Cory Booker against Republican nominee Justin Murphy [1]. Other candidates include Joanne Kuniansky (Socialist Workers Party) and Justin Maldonado (Independent) [2][3][4][5]. As of September 7, 2026, Decision Desk HQ forecasts the New Jersey Senate race as 'Safe Democratic,' with Cory Booker having a 96% win probability [5][6].
The general election is scheduled for November 3, 2026 [7][2][3][4][8]. As of September 2026, prediction markets generally favor Republicans to retain control of the U.S. Senate [9][10][11][12]. However, specific Senate seat markets remain dynamic, influenced by polling, candidate events, and national midterm environment factors [9][10][11][12].

Key Dates & Catalysts

  • Expiration: November 03, 2027
  • Closes: November 03, 2027
Sources (12)
  1. 12026 United States Senate election in New Jersey - Wikipediaen.wikipedia.org
  2. 2United States Senate election in New Jersey, 2026 - Ballotpediaballotpedia.org
  3. 3Joanne Kuniansky - Ballotpediaballotpedia.org
  4. 4Justin Maldonado - Ballotpediaballotpedia.org
  5. 52026 New Jersey US Senate Forecastvotes.decisiondeskhq.com
  6. 62026 U.S. Senate Forecast | Decision Desk HQvotes.decisiondeskhq.com
  7. 7The 2026 Midterms: Key Dates and Events - Bipartisan Policy Centerbipartisanpolicy.org
  8. 82026 New Jersey US Senate | Live Election Resultsvotes.decisiondeskhq.com
  9. 9Which party will win the Senate in 2026? Predictions & Od... | Polymarketpolymarket.com
  10. 10Senate 2026 Odds: Live Prediction Market Tracker for Chamber Control – Bellwetherbellwether.market
  11. 112026 US Senate Control Odds & Analysis | Prediction Geniuspredictiongenius.io
  12. 122026 Live Midterms Forecasts by State | Kalshikalshi.com