Democratic nomination odds leader on October 31?

According to the latest prediction market data for the query “Democratic nomination odds leader on October 31?”, traders have formed a strong consensus.

Currently, Gavin Newsom is dominating the market with an overwhelming 37% chance of winning. Jon Ossoff follows in second place at 35%, while Alexandria Ocasio-Cortez sits in third with 26%. The betting volume for this specific market has already reached $155.2K, 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

• Gavin Newsom (37%): Currently commanding the highest probability, Gavin Newsom is heavily favored by the order book. Traders looking to back this outcome face a “Buy Yes” contract price of 37¢, signaling a high degree of market conviction. This contract alone has generated $45.8K in volume.

🥈 Tier 2: The Primary Challengers

• Jon Ossoff (35%): Positioned as the most viable alternative, Jon Ossoff maintains a 35% chance of resolving true. Its “Buy Yes” shares currently trade at 35¢.
• Alexandria Ocasio-Cortez (26%): Sitting in third place with a 26% probability, the market shows measured skepticism toward Alexandria Ocasio-Cortez, treating it as an outside wildcard unless momentum shifts.

🥉 Tier 3: The Long-Tail Options (Combining for ~2%)

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 Kamala Harris (0.1%), and Josh Shapiro (0.1%).
• Speculative Volume: Despite low statistical likelihood, certain long-tail contracts like Kamala Harris are still attracting notable interest.

This market will resolve according to the option with the highest hourly odds value in the "2028 Democratic Nomination" listing on PredictionMarketOdds.com for the "Time Window (ET)" ending at 12:00 PM ET on October 31, 2026. If that option is not a listed outcome of this market, this market will resolve to "Other".

An hourly odds value is the value in the "Odds of Happening" column that PredictionMarketOdds.com publishes for an option for a one-hour "Time Window (ET)", as shown on the listing page and in the "Odds History" graph on that option's detail page. Hourly odds values are compared at the precision published by PredictionMarketOdds.com (one tenth of a percent).

If PredictionMarketOdds.com publishes "NO_PRINT" for an option for the specified window, that option's most recent published hourly odds value before the specified window will be used. If PredictionMarketOdds.com has not published anything for the specified window for an option (neither an hourly odds value nor "NO_PRINT"), this market will remain open until a value or "NO_PRINT" for that window is published, and may remain open until November 7, 2026, 11:59 PM ET for that purpose. If nothing has been published for the specified window by that time, that option's most recent published hourly odds value before the specified window will be used. An option with no hourly odds value published in that period will not be considered.

If two or more options are tied for the highest value, the tie will be broken in favor of the tied option with the higher value in the most recent earlier window in which their values differed. If the tie persists, this market will resolve in favor of the tied option whose listed name comes first alphabetically.

If the underlying market is officially decided before the listed end date, this market will resolve in favor of the outcome of the underlying market if it is a listed outcome, and otherwise to "Other".

If a published hourly odds value is clearly erroneous as a result of a technical or operational error, this market may remain open for up to an additional 48 hours after that value is first published to allow for a correction. A corrected value will be used in place of the original. If no correction is published within that period, the original value will stand, and revisions published after that period will not be considered.

The resolution source for this market is PredictionMarketOdds.com, specifically the hourly odds values for the options in the "2028 Democratic Nomination" listing at https://predictionmarketodds.com/dem-nomination-2028.html and on each option's detail page, reached by clicking the option's name in the listing. Prices shown on any individual prediction market will not be considered.

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 Gavin Newsom currently trades at 37%, but our AI places its Fair Value at just 19.5%. This creates a large negative EV Gap of -17.5%, suggesting the crowd may be overhyping this outcome and driving the premium too high.
• The Best Value Play (Highest EV) Our model identifies Josh Shapiro as the premium value opportunity on the board. While the market only assigns it a 0.1% trading probability, our AI’s Fair Value assessment sits at 12% — yielding an impressive +12% EV Gap.
• Under-the-Radar Dark Horses Other notable discrepancies include Kamala Harris (EV Gap: +11.7%). These long-tail opportunities are heavily discounted by the live order books despite stronger statistical backing from our predictive model.