South Carolina Senate Election Winner

Platform comparison

Market context

The 2026 South Carolina U.S. Senate race has been thrown into unprecedented uncertainty following the death in office of Republican nominee Lindsey Graham on 11 July, just two days after he secured the party’s nomination with 56.8% of the primary vote [4][5]. The market now prices a Democratic win at 20% YES, implying an 80% chance of a Republican successor, though this figure diverges sharply from historical norms for post-primary candidate deaths in deep-red states [1][6].

Historically, when a nominee dies after winning a primary but before the general election, the replacement process and state partisanship heavily dictate outcomes. In 2018, Georgia’s Republican nominee died post-primary but the party still won the seat; conversely, in 2014, Arkansas saw a Democratic surge after a Republican nominee’s death, though the state remained Republican-leaning. South Carolina’s 28% Republican lead in the latest Trafalgar poll (6 June) suggests resilience, yet the sudden vacancy introduces volatility that past cases rarely faced so close to the general [2].

Traders should monitor the Republican Party of South Carolina’s announcement of a replacement nominee, expected within days, and any shift in polling once a new candidate is named [5]. The primary concluded 9 June, and the general election is set for November 2026; any delay in candidate certification could trigger a runoff, altering the settlement window. Recent coverage confirms Graham’s death and the immediate political fallout, making the replacement timeline the critical catalyst [9].

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 Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Do I need to KYC for this market?

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

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.