Elections Intelligence

Kansas U.S. Senate

DEFENDED SEATLean R to Toss-up

Roger Marshall (R) has held this seat since 2021 and is running for re-election. Before that: Pat Roberts (R).

Adam Hamilton Challenger
39¢
Party market · checked 2:09 PM ETView on Kalshi ↗
63¢
Roger Marshall Incumbent

FTP Race Signal

FTP Race SignalA composite of market, polling and money. The prediction-market price anchors it; a polling average moves it: the last 30 days, or the three most recent pollsters when fewer polled. Polls paid for by a candidate, party or allied group move 2 points toward the other side and count half. When the three most recent independent pollsters each have the race within three points, it is a Toss-up unless the market is already decisive. Fundraising counts only at a five-to-one gap. Past results are context, not inputs. A rating changes only when the evidence clears the line.

The market is less sure of this seat than its history is: an 11-point Republican hold in 2020, priced at 63¢ today.

Toss-up
Safe DLikely DLean DToss-upLean RLikely RSafe R
Polling · Toss-upD+1.9 (average of 8 pollsters, Oct 10). Market · Toss-upR 63¢: traders' price for a Republican hold. Prior result · Lean RR+11.43 in 2020.

Market favors Marshall, but polls favor Hamilton.

The market moved 4¢ toward the Democrat in the last 7 days · polling moved 6 points toward the Democrat over 30 days. As of October 12.

Market

BandPRICEToss-up50¢ to 65¢Lean65¢ to 82¢Likely82¢ to 95¢Safe95¢ and above
R 63¢

Kalshi party market · checked 2:09 PM ET

View market on Kalshi ↗

Polling

BandPOINTSToss-up0 to 5Lean5 to 10Likely10 to 20Safe20 and above
D+1.9
InsiderAdvantage ↗ B+ Oct 9 to 10 · n=1,200 LV D+1 Independent
GBAO ↗ B Sep 30 to Oct 4 · n=600 LV D+5 D-leaning firm
YouGov ↗ B+ Sep 24 to Oct 4 · n=2,255 LV D+3 Independent
Trafalgar Group ↗ C+ Sep 29 to Oct 1 · n=1,095 LV D+0.9 Independent
NYT/Siena ↗ A+ Sep 22 to 30 · n=504 LV R+1 Independent
Wedgewood Polls ↗ Sep 22 to 24 · n=500 LV D+2 Independent
Emerson College ↗ A+ Sep 15 to 16 · n=750 LV D+2 Independent
GSG ↗ B- Sep 13 to 16 · n=800 LV D+4 Democratic Attorneys General Association sponsor D+4 · Democratic Attorneys General Association sponsor · counts as D+2 at half weight

Average of the latest poll from each of 8 pollsters in the last 30 days. Polls paid for by a candidate, party or allied group move 2 points toward the other side and count half.

Earlier polls · 4
co/efficient ↗ B Sep 8 to 10 · n=915 LV R+5 R-leaning firm
GSG ↗ B- Aug 12 to 16 · n=800 LV D+1 D-leaning firm
PPP ↗ B Aug 7 to 8 · n=569 voters R+1 A Democratic super PAC (not named in the report) sponsor R+1 · A Democratic super PAC (not named in the report) sponsor · counts as R+3 at half weight
Tavern Research ↗ Jan 26 to 28 · n=1,013 LV D+2 Independent

Prior result

BandPOINTSToss-up0 to 5Lean5 to 12Likely12 to 25Safe25 and above
R+11.4

Roger Marshall (R)

53.2% to 41.8% · 2020 general election

def. Barbara Bollier (D). Margin verified against retrieved official results.

Fundraising

BandRATIO TO 1Parity1 to 5Lean5 and above
1 to 1

Raised 2025 to 2026 · thru Jul 15

Adam Hamilton$4.17M ↗$1.73M cash
Roger Marshall$4.01M ↗$5.39M cash

Total receipts in the 2025 to 2026 two-year cycle, through July 15, 2026; the two campaigns have raised about the same, so fundraising takes no place on the spectrum.

The general election is on November 3, which is 22 days away.