The Democratic Party wins the South Carolina U.S. Senate race in 2026.
South Carolina holds its U.S. Senate election in the 2026 midterms. Resolution requires the Democratic nominee to win the general election or any subsequent runoff.
Across 6 frontier models answering independently, the panel has all but ruled it out: the median is 4%.
They broadly agree, 5 points between GPT at 7% and Qwen at 2%.
Money disagrees. The market sits at 28%, so the models are 24 points less confident than people with cash on the outcome — one of the wider gaps in the archive.
Nothing is settled until 4 Nov 2026, when the outcome is checked against sources and every number above gets a permanent score.
- AI edge
- -24 pts
- Moved this week
- +8 pts
- Volume
- $738K
The models are clearly less confident than traders risking real money: 4% against 28%.
What each one said
-
GPTOpenAI
South Carolina’s entrenched Republican lean leaves Democrats needing an unusually strong national wave and candidate mismatch.
- The Democratic nominee must beat the Republican nominee on November 3, with a runoff possible only if no candidate clears 50%.
- Republicans have won every South Carolina Senate race since 1998; recent statewide federal margins make an upset a low-base-rate event.
- A credible late poll showing a Democratic lead, or a major Republican nominee scandal, would materially raise the chance.
7% -
GeminiGoogle
South Carolina's structural partisan lean makes a Democratic Senate flip virtually impossible barring a catastrophic Republican scandal.
- Lindsey Graham won reelection by 10 points in 2020 despite record-breaking $100M+ fundraising by Democrat Jaime Harrison.
- No Democrat has won a statewide race in South Carolina since 2006, giving the GOP an entrenched double-digit baseline advantage.
- A flip would require an extreme Roy Moore-style GOP collapse paired with massive Black turnout in a low-turnout midterm environment.
4% -
ClaudeAnthropic
South Carolina is deeply red; GOP incumbent heavily favored in a non-wave environment.
- South Carolina hasn't elected a Democratic senator since 1998 and Republicans win statewide by double digits routinely.
- No indication of a top-tier Democratic recruit or scandal-driven collapse that would flip this seat.
- Only a historic blue-wave midterm plus a strong Democratic recruit would meaningfully change this.
4% -
DeepSeekDeepSeek
This turns on whether a Democratic wave can overcome South Carolina's roughly 18-point Republican lean.
- South Carolina has not elected a Democratic senator since 1998, and Trump won the state by 18 points in 2024, so the partisan baseline is forbidding.
- Lindsey Graham is the likely GOP nominee and holds a large cash and name-ID advantage; no top-tier Democrat has entered, and filing closed in March 2026.
- The only plausible path is a Graham primary loss to a far-right challenger plus a national Democratic wave, which is a low-probability combination.
4% -
GrokxAI
Graham’s incumbency and SC’s R+8-to-R+12 lean make a Dem Senate win vanishingly rare six days out.
- Graham has led every public poll by double digits; no late scandal or turnout shock has appeared by 29 Oct.
- SC last sent a Democrat to the Senate in 1998; midterm maps and registration gaps have only widened since.
- Only a Graham withdrawal or certified vote-count error after 3 Nov would reverse this; neither is in motion.
3% -
QwenAlibaba
South Carolina is R+15 and hasn't elected a Democrat to the Senate since 1998; no credible path exists in 2026.
- SC voted Trump +16 in 2024; no Democrat has won a statewide race there in nearly two decades, making a Senate flip functionally impossible.
- Even in wave years like 2006 and 2008, Democrats lost SC Senate races by double digits; the state's partisan lean has only deepened since.
- A Democrat would need a catastrophic Republican collapse (scandal, candidate death, etc.) to even approach competitiveness, and no such event has materialized.
2%
6 of 6 models answered · 5 points between the highest and lowest. None was shown the market price.
Resolution criteria
This market will resolve according to the winner of the 2026 midterm South Carolina U.S. Senate election, inclusive of any run-offs. A candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date. Candidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party. The candidates may be named in the contract for the convenience of traders. In the event that any named candidate is replaced as the nominee of their respective party prior to election day, the name in the contract will be updated and the market will resolve based on the replacement nominee of the party. The resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.
Question sourced from Polymarket on 29 Oct 2026. Forecast by google/gemini-3.8-flash, anthropic/claude-sonnet-5, openai/gpt-5.6-terra, x-ai/grok-4.6, deepseek/deepseek-v4.1-flash, qwen/qwen3.8-max-0902 via OpenRouter.