Closest Senate Race?

According to the latest prediction market data for the query “Closest Senate Race?”, traders have formed a strong consensus.

Currently, Mississippi is dominating the market with an overwhelming 79.3% chance of winning. Alaska follows in second place at 8.5%, while Montana sits in third with 1.6%. The betting volume for this specific market has already reached $102.7K, reflecting intense industry interest.

To better assess where each potential outcome stands, the market can be segmented into three distinct trading tiers based on implied probability and contract pricing:

🥇 Tier 1: The Dominant Leader

• Mississippi (79.3%): Currently commanding the highest probability, Mississippi is heavily favored by the order book. Traders looking to back this outcome face a “Buy Yes” contract price of 79¢, signaling a high degree of market conviction. This contract alone has generated $9.1K in volume.

🥈 Tier 2: The Primary Challengers

• Alaska (8.5%): Positioned as the most viable alternative, Alaska maintains a 8.5% chance of resolving true. Its “Buy Yes” shares currently trade at 8¢.
• Montana (1.6%): Sitting in third place with a 1.6% probability, the market shows measured skepticism toward Montana, treating it as an outside wildcard unless momentum shifts.

🥉 Tier 3: The Long-Tail Options (Combining for ~10.7%)

Beyond the top three choices, a wide field of macro variables and long-shot outcomes are being tracked. While their individual probabilities hover low, they represent crucial hedges for speculative traders:

• Alternative Options: This includes Michigan (1.6%), Maine (1.5%), and Kansas (1.4%).
• Speculative Volume: Despite low statistical likelihood, certain long-tail contracts like Iowa are still attracting notable interest.

The 2026 midterm elections are scheduled to be held on November 3, 2026.

This market will resolve according to the US Senate race which has the smallest margin of victory.

For the purpose of this market, the “margin of victory” is defined as the absolute difference between the percentages of valid votes received by the first- and second-place candidates. Percentages of the valid votes received by each candidate will be determined by dividing the total number of valid votes each of the top two candidates receives by the sum of all valid votes cast in the election.

For elections that include runoffs, ranked-choice, or other multi-round elections, the relevant margin of victory will be that of the round in which the winner is determined.

If two state margins of victory are identical, this market will resolve to the tied state whose name comes first alphabetically.

This market will consider all regular and special Senate elections that determine representation in the upcoming 120th Congress and are scheduled to take place in November 2026 as of October 31, 2026.

The resolution source for this market will be a compilation of all of the relevant state election authorities responsible for certifying statewide elections, however, a consensus of credible reporting may also be used.

While human consensus and speculative volume shape the broader prediction market, our quantitative algorithms offer a data-driven counter-perspective. By analyzing fundamental signals, underlying trends and historical distributions, our AI Valuation model calculates an independent “Fair Value” probability for each outcome.

Comparing this Fair Value against the current Trade Value uncovers major disparities — known as the Expected Value (EV) Gap. Contracts with a positive EV Gap represent statistically underpriced outcomes, whereas a negative EV Gap flags a potential market overreaction.

Top AI Alpha & Mispriced Arbitrage Opportunities

Based on the latest data model run, several key contracts stand out with significant deviations:

• The Most Overvalued Outcome Mississippi currently trades at 79.3%, but our AI places its Fair Value at just 21.7%. This creates a large negative EV Gap of -57.6%, suggesting the crowd may be overhyping this outcome and driving the premium too high.
• The Best Value Play (Highest EV) Our model identifies South Carolina as the premium value opportunity on the board. While the market only assigns it a 1.1% trading probability, our AI’s Fair Value assessment sits at 7.4% — yielding an impressive +6.4% EV Gap.
• Under-the-Radar Dark Horses Other notable discrepancies include Kansas (EV Gap: +5.6%) and Nebraska (EV Gap: +4.8%). These long-tail opportunities are heavily discounted by the live order books despite stronger statistical backing from our predictive model.