South Carolina Senate Election Winner

Platform comparison

Market context

South Carolina’s 2026 U.S. Senate race has been thrown into turmoil after Republican nominee Lindsey Graham won the primary on 9 June with 56.8% of the vote, only to die in office two days before the general election on 11 July [2]. The market’s current 20% YES probability for a non-Republican winner reflects the uncertainty over whether the state will hold a special election, appoint a successor, or proceed with Graham’s name on the ballot under succession laws.

Historically, when an incumbent or nominee dies shortly before a general election in a deep-red state like South Carolina, the party typically retains the seat either through a replacement nominee or by keeping the deceased’s name on the ballot. In 2018, Georgia held a special election after Senator Johnny Isakson’s resignation, but the Republican still won; in 2020, Arizona’s Republican nominee died post-primary yet the party secured the seat via a replacement [2]. These cases suggest the 20% implied probability may undervalue Republican resilience, with value potentially sitting on the Republican side if succession rules favour the party nominee.

Traders should monitor whether South Carolina officials announce a special election, appoint a replacement, or confirm Graham’s name remains on the ballot. Key catalysts include the governor’s statement on succession procedures and any court rulings on ballot eligibility. ABC News reported that Graham’s passing “sets in motion processes that will ensure someone fills the seat,” but the mechanism remains unconfirmed [10]. Watch for announcements from SC Votes or the state legislature before the settlement window closes in November 2026.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.