South Carolina Senate Election Winner

Platform comparison

Market context

Voters in South Carolina will elect a U.S. Senator on 3 November 2026, but the race has been thrown into turmoil following the death of four-term incumbent Lindsey Graham just two days before the current date. Graham had already secured the Republican nomination in the June primary, winning 56.8% of the vote, but his passing triggers a fast-tracked special primary on 11 August to select a new nominee [2]. The Democratic nominee, pediatrician Annie Andrews, won her party’s contest with 61.5% of the vote and now faces an open Republican field rather than a confirmed incumbent [2].

The crowd-implied 20% probability for a Democratic win reflects the historical difficulty Democrats face in South Carolina, where Republicans have held the Senate seat for decades, yet the sudden vacancy creates a unique volatility comparable to other mid-term succession races where party momentum shifts rapidly after an incumbent’s death. While Andrews is the clear Democratic standard-bearer, the replacement Republican candidate remains unknown, meaning the current price is essentially betting on the party’s ability to unify quickly behind a successor who can match Graham’s former dominance [2].

Traders must monitor the 11 August special primary results, as the identity and political profile of the new Republican nominee will be the primary catalyst for price movement. Recent reporting confirms that businessman Mark Lynch, who finished second in the original primary, has confirmed his intention to run in the special election, though other candidates may emerge [8]. The outcome of this August contest will determine whether the Republican field remains consolidated or fractures, directly influencing the likelihood of Andrews securing the seat in November.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Market UK. 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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.