No clear movePolymarket 0.0pp; Kalshi +2.5pp across each venue's recorded span.
Senate seat arithmetic
Republicans hold 53 of 100; 51 is a majority. The other 47 need a net 4.
The aggregate control contract does not identify which individual seats would supply that net gain.
The current race ledger
10 Senate races, then 12 governors, each group by state, A to Z.
12 races have snapshot data but no desk note yet. They still appear in full: North Carolina Senate, Georgia Senate, Nebraska Senate, New Hampshire Senate primary, Iowa governor, Alaska governor, Michigan governor, Arizona governor, Texas governor, New York governor, Pennsylvania governor, Florida governor.
Senate
Alaska SenateA sitting Republican senator is defending this seatMary Peltola vs. Dan SullivanCandidate contracts price the named people.Both venues name Mary Peltola ahead.Polymarket:Mary Peltola64.5% · Dan Sullivan35.5%Kalshi:Mary Peltola63.0% · Dan Sullivan37.0%
Mary Peltola
Democratic · Candidate contract
Polymarket
64.5%
Recorded span
8 samples / 7 intervals; +8.0pp across that span
Volume
$236K
Question
Will Mary Peltola win the Alaska Senate race in 2026?
Georgia SenateJon Ossoff vs. Mike CollinsCandidate contracts price the named people.Both venues name Jon Ossoff ahead.Polymarket:Jon Ossoff93.5% · Mike Collins6.3%Kalshi:Jon Ossoff92.5% · Mike Collins7.6%
Jon Ossoff
Democratic · Candidate contract
Polymarket
93.5%
Recorded span
8 samples / 7 intervals; +1.0pp across that span
Volume
$48.4K
Question
Will the Democrats win the Georgia Senate race in 2026?
Iowa SenateAn open seat, with no incumbent runningAshley Hinson vs. Josh TurekCandidate contracts price the named people.Both venues name Ashley Hinson ahead.Polymarket:Ashley Hinson60.5% · Josh Turek40.5%Kalshi:Ashley Hinson62.5% · Josh Turek37.5%
Ashley Hinson
Republican · Candidate contract
Polymarket
60.5%
Recorded span
8 samples / 7 intervals; 0.0pp across that span
Volume
$109K
Question
Will the Republicans win the Iowa Senate race in 2026?
Maine SenateDemocrats only got a candidate here after their primary winner withdrewTroy Jackson vs. Susan CollinsCandidate contracts price the named people.Both venues name Troy Jackson ahead.Polymarket:Troy Jackson69.5% · Susan Collins31.5%Kalshi:Troy Jackson69.5% · Susan Collins30.5%
Troy Jackson
Democratic · Candidate contract
Polymarket
69.5%
Recorded span
8 samples / 7 intervals; -1.0pp across that span
Volume
$732K
Question
Will the Democrats win the Maine Senate race in 2026?
Michigan SenateAbdul El-Sayed vs. Mike RogersCandidate contracts price the named people.Both venues name Abdul El-Sayed ahead.Polymarket:Abdul El-Sayed64.5% · Mike Rogers35.5%Kalshi:Abdul El-Sayed61.5% · Mike Rogers38.5%
Abdul El-Sayed
Democratic · Candidate contract
Polymarket
64.5%
Recorded span
8 samples / 7 intervals; +1.5pp across that span
Volume
$330K
Question
Will the Democrats win the Michigan Senate race in 2026?
Nebraska SenatePete RickettsCandidate contracts price the named people.Both venues name Pete Ricketts ahead.Polymarket:Pete Ricketts70.5%Kalshi:Pete Ricketts69.5%
Pete Ricketts
Republican · Candidate contract
Polymarket
70.5%
Recorded span
8 samples / 7 intervals; 0.0pp across that span
Volume
$90.8K
Question
Will the Republicans win the Nebraska Senate race in 2026?
New Hampshire Senate primaryChris PappasCandidate contracts price the named people.Both venues name Chris Pappas ahead.Polymarket:Chris Pappas94.3%Kalshi:Chris Pappas94.2%
North Carolina SenateRoy Cooper vs. Michael WhatleyCandidate contracts price the named people.Both venues name Roy Cooper ahead.Polymarket:Roy Cooper91.5% · Michael Whatley8.5%Kalshi:Roy Cooper92.2% · Michael Whatley8.3%
Roy Cooper
Democratic · Candidate contract
Polymarket
91.5%
Recorded span
8 samples / 7 intervals; 0.0pp across that span
Volume
$40.8K
Question
Will the Democrats win the North Carolina Senate race in 2026?
Ohio SenateA special election, to serve out the rest of someone else's Senate termSherrod Brown vs. Jon HustedCandidate contracts price the named people.Both venues name Sherrod Brown ahead.Polymarket:Sherrod Brown54.5% · Jon Husted45.5%Kalshi:Sherrod Brown53.5% · Jon Husted46.5%
Sherrod Brown
Democratic · Candidate contract
Polymarket
54.5%
Recorded span
8 samples / 7 intervals; +1.0pp across that span
Volume
$110K
Question
Will the Democrats win the Ohio Senate race in 2026?
Texas SenateKen Paxton vs. James TalaricoCandidate contracts price the named people.≠The books name different leaders.Polymarket:Ken Paxton48.5% · James Talarico49.5%Kalshi:Ken Paxton50.5% · James Talarico49.5%
Ken Paxton
Republican · Candidate contract
Polymarket
48.5%
Recorded span
8 samples / 7 intervals; 0.0pp across that span
Volume
$524K
Question
Will the Republicans win the Texas Senate race in 2026?
Important statewide races; they do not determine control of Congress.
Alaska governorBernadette Wilson vs. Tom BegichCandidate contracts price the named people.Both venues name Bernadette Wilson ahead.Polymarket:Bernadette Wilson35.5% · Tom Begich1.5%Kalshi:Bernadette Wilson35.5% · Tom Begich0.9%
Bernadette Wilson
Republican · Candidate contract
Polymarket
35.5%
Recorded span
8 samples / 7 intervals; 0.0pp across that span
Volume
$167K
Question
Will Bernadette Wilson win the 2026 Alaska governor election?
Arizona governorKatie Hobbs vs. Andy BiggsCandidate contracts price the named people.1/2One venue only; no cross-venue comparison.Polymarket:Not pricedKalshi:Katie Hobbs86.5% · Andy Biggs13.5%
Katie Hobbs
Democratic · Candidate contract
Polymarket
Not priced
This venue does not price this candidate in the edition snapshot.
Kalshi
86.5%
Bid / ask
86.0% / 87.0%
Volume
304K contracts
Question
Will the Democratic party win the governorship in Arizona
Florida governorByron Donalds vs. David JollyCandidate contracts price the named people.1/2One venue only; no cross-venue comparison.Polymarket:Not pricedKalshi:Byron Donalds83.5% · David Jolly17.5%
Byron Donalds
Republican · Candidate contract
Polymarket
Not priced
This venue does not price this candidate in the edition snapshot.
Kalshi
83.5%
Bid / ask
83.0% / 84.0%
Volume
179K contracts
Question
Will the Republican party win the governorship in Florida
Georgia governorGeorgia's governor's office is openKeisha Lance Bottoms vs. Rick JacksonCandidate contracts price the named people.Both venues name Keisha Lance Bottoms ahead.Polymarket:Keisha Lance Bottoms59.0% · Rick Jackson40.0%Kalshi:Keisha Lance Bottoms59.5% · Rick Jackson41.5%
Keisha Lance Bottoms
Democratic · Candidate contract
Polymarket
59.0%
Recorded span
8 samples / 7 intervals; -1.0pp across that span
Volume
$32.4K
Question
Will the Democrats win the Georgia governor race in 2026?
Iowa governorRob Sand vs. Zach LahnCandidate contracts price the named people.Both venues name Rob Sand ahead.Polymarket:Rob Sand74.5% · Zach Lahn25.5%Kalshi:Rob Sand74.5% · Zach Lahn26.5%
Rob Sand
Democratic · Candidate contract
Polymarket
74.5%
Recorded span
8 samples / 7 intervals; +1.0pp across that span
Volume
$31.0K
Question
Will the Democrats win the Iowa governor race in 2026?
Michigan governorJocelyn Benson vs. John JamesCandidate contracts price the named people.1/2One venue only; no cross-venue comparison.Polymarket:Not pricedKalshi:Jocelyn Benson89.1% · John James10.7%
Jocelyn Benson
Democratic · Candidate contract
Polymarket
Not priced
This venue does not price this candidate in the edition snapshot.
Kalshi
89.1%
Recorded span
6 samples / 5 intervals; +2.1pp across that span
Bid / ask
87.0% / 91.3%
Volume
72.5K contracts
Question
Will the Democratic party win the governorship in Michigan
Nevada governorNevada's Republican governor is defending his jobJoe Lombardo vs. Aaron FordCandidate contracts price the named people.Both venues name Joe Lombardo ahead.Polymarket:Joe Lombardo59.5% · Aaron Ford41.0%Kalshi:Joe Lombardo59.0% · Aaron Ford41.0%
Joe Lombardo
Republican · Candidate contract
Polymarket
59.5%
Recorded span
8 samples / 7 intervals; 0.0pp across that span
Volume
$49.2K
Question
Will the Republicans win the Nevada governor race in 2026?
New York governorKathy Hochul vs. Bruce BlakemanCandidate contracts price the named people.1/2One venue only; no cross-venue comparison.Polymarket:Not pricedKalshi:Kathy Hochul94.3% · Bruce Blakeman6.0%
Kathy Hochul
Democratic · Candidate contract
Polymarket
Not priced
This venue does not price this candidate in the edition snapshot.
Kalshi
94.3%
Bid / ask
94.2% / 94.4%
Volume
270K contracts
Question
Will the Democratic party win the governorship in New York
Ohio governorOhio is choosing a new governorAmy Acton vs. Vivek RamaswamyCandidate contracts price the named people.Both venues name Amy Acton ahead.Polymarket:Amy Acton53.5% · Vivek Ramaswamy46.5%Kalshi:Amy Acton55.5% · Vivek Ramaswamy44.5%
Amy Acton
Democratic · Candidate contract
Polymarket
53.5%
Recorded span
8 samples / 7 intervals; +4.0pp across that span
Volume
$79.3K
Question
Will the Democrats win the Ohio governor race in 2026?
Wisconsin governorAn open governorshipDavid Crowley vs. Tom TiffanyCandidate contracts price the named people.1/2One venue only; no cross-venue comparison.Polymarket:Not pricedKalshi:David Crowley79.5% · Tom Tiffany20.5%
David Crowley
Democratic · Candidate contract
Polymarket
Not priced
This venue does not price this candidate in the edition snapshot.
Kalshi
79.5%
Recorded span
8 samples / 7 intervals; +0.5pp across that span
Bid / ask
79.0% / 80.0%
Volume
435K contracts
Question
Will the Democratic party win the governorship in Wisconsin
How this desk reads the two booksThe comparison basis, and today's four irreducible facts
Since the previous edition
This edition predates stable race identifiers, so it cannot be compared with another edition. Contest names drift between editions, and joining on them would report moves that never happened.
Today's four irreducible facts
Each claim keeps the two venues separate.
House control
Democratic-control contracts:
Polymarket 88.5%Kalshi 84.5%
Senate control
Democratic-control contracts:
Polymarket 50.5%Kalshi 48.5%
Recorded-span changes: Polymarket 0.0pp; Kalshi +2.5pp. No clear move.
Texas Senate
The books name different leaders.
PolymarketJames Talarico leadsKalshiKen Paxton leadsPolymarket:Ken Paxton48.5% · James Talarico49.5%Kalshi:Ken Paxton50.5% · James Talarico49.5%
Iowa Senate
Josh Turek has the widest current candidate-side venue gap, 3.0pp.
Polymarket 40.5%Kalshi 37.5%
Arizona governor — and 6 more
Kalshi only; no cross-venue comparison.
Polymarket:Not pricedKalshi:Katie Hobbs86.5% · Andy Biggs13.5%
Method and scope
These are trader-implied market prices, not polls and not POLI forecasts.
Polymarket volume is USD notional; Kalshi volume is contracts. They are not comparable, so this page does not combine or weight them.
Separately traded candidate contracts are independent and do not have to sum to 100%.
This is a dated snapshot observed Aug 29, 9:55 AM CT, not a live feed.
This edition contains 22 races from its published snapshots: no polls, no vote counts, and no inferred contests.
Edition changes publish only when stable race identity, contest kind, market scope, and venue identity make subtraction safe.