A Democrat is ahead in Polymarket’s Kansas Senate election market on the eve of the November 3 midterms, even after President Donald Trump made a second campaign visit to the traditionally Republican state. But the crucial timing matters: Adam Hamilton overtook Republican incumbent Roger Marshall on prediction markets before Trump’s final Kansas rally. Votendi’s independently compiled polling average also has Hamilton ahead, though by a much smaller measure: 47.8% to 45.2%.
For a state that has not elected a Democratic US senator since 1932, the closing days of this contest have drawn unusual national attention. Trump’s November 1 rally in Salina was intended to help Marshall mobilize Republican voters, while new surveys and market prices have highlighted the competitiveness of the race. There is, however, no established evidence that the rally itself caused Hamilton’s market odds to rise.
Polymarket: Hamilton at 62%, Marshall at 39%
In a November 2 snapshot of Polymarket’s Kansas Senate winner contract, Hamilton’s YES shares traded around 62¢ and Marshall’s around 39¢, corresponding to market-implied probabilities of about 62% and 39%. The contract had attracted more than $2.3 million in total trading volume at the time checked. Prices fluctuate throughout trading, and separately quoted contracts may not add to exactly 100%.
That is a marked reversal from October 28. Action Network’s October 31 market report documented Marshall trading at around 61¢ on Wednesday, October 28, while Hamilton stood near 41¢. By the morning of Saturday, October 31, Hamilton had moved ahead at roughly 52¢ on Polymarket against 50¢ for Marshall.
| Market snapshot | Hamilton (D) | Marshall (R) |
|---|---|---|
| Oct. 28 (reported prices) | About 41% | About 61% |
| Oct. 31 (Action Network report) | About 52% | About 50% |
| Nov. 2 (Polymarket snapshot) | About 62% | About 39% |
Sources: Action Network’s October 31 report and Polymarket’s live Kansas contract. These are dated market-price snapshots, not a continuous price series, official results or a probability model produced by Votendi.
Votendi’s Kansas polling average: Hamilton 47.8%, Marshall 45.2%
Votendi’s Kansas Senate polling tracker, checked November 2, is based on nine published polls with the latest included fieldwork ending November 1. It currently reports:
| Candidate | Votendi weighted polling average |
|---|---|
| Adam Hamilton (Democrat) | 47.8% |
| Roger Marshall (Republican) | 45.2% |
| Hamilton’s lead | +2.6 percentage points |
The tracker also displays Libertarian David Graham at 4.0%, but that figure comes from only two polls testing him, not all nine. Candidate averages therefore should not be added together as if they were shares from one identical set of surveys.
Votendi’s model uses poll recency, sample size, pollster grade, methodology and editorial weights, with a 30-day recency half-life. The nine polls currently listed include the latest New York Times/Siena survey but not every late-campaign survey cited elsewhere, so this is a transparent snapshot of the current published Votendi dataset, not a claim that every available national survey is incorporated.
A 2.6-point polling lead is not a 62% probability of winning. The first measures reported voting intentions averaged across surveys; the second reflects what prediction-market participants pay for an outcome. They answer different questions and cannot be compared percentage-for-percentage.
Late polls explain the change in the race’s perception
Several recent surveys put Hamilton ahead. The November 1 New York Times/Siena survey measured Hamilton at 49% and Marshall at 44% among likely voters. The Washington Post/George Mason University Schar School survey put the candidates at 52% to 43%; CNN/SSRS measured 49% to 45%. Other polls have shown narrower differences, including an October InsiderAdvantage survey with Marshall slightly ahead.
These polls are a more directly observable development than any presumed psychological effect of a campaign stop. They help explain why both national attention and trading activity intensified. Individual surveys have sampling and nonsampling uncertainty, and late turnout patterns could still produce results outside the range suggested by current averages.
Trump visited Kansas twice — but the market flipped before the second rally
Trump campaigned in Park City on October 19 and returned on Sunday, November 1, for an event at Salina Regional Airport. He explicitly backed Marshall and urged supporters to vote on Tuesday, describing the stop as his final in-person rally of the midterm campaign. Local reporting from KWCH and KCUR confirms the two visits.
The chronology is important. Hamilton’s first documented lead on Polymarket in the late-October reports was already evident on October 31, a day before the Salina rally. His market price was higher in the November 2 snapshot, after the event, but that sequence does not establish the event as the cause. The latest polls were published or discussed during the same period, and prediction markets respond to many sources of information.
The broader political stakes are unusually high. The Kansas contest involves an incumbent Republican in a state with a long history of voting Republican in Senate elections. Reporting has highlighted concerns about living costs, tariffs and farm-related expenses as issues in the campaign; Republicans are emphasizing turnout and the president’s agenda, while Hamilton has sought support beyond the Democratic base.
What to watch on Election Day
The November 3 result will provide an unusually clear comparison between three different signals: individual late polls, Votendi’s multi-poll weighted average and the prediction market’s election-winner contract. The questions are whether the polling lead survives the final Republican turnout push and how closely the market’s last pre-election price corresponds to the ultimate outcome.
Neither the current polling average nor Polymarket’s quoted odds constitute a certified result. Votendi will retain its pre-election polling data for comparison with official returns as they become available.
Sources and methodology (November 2, 2026): Votendi Kansas Senate tracker (nine published surveys, latest fieldwork Nov. 1); Votendi methodology; Polymarket Kansas Senate winner contract; Action Network historical market snapshot, Oct. 31; New York Times/Siena final-state surveys; KCUR reporting from Salina; KWCH reporting from Salina. Market prices may have changed since these snapshots.
