South Carolina Senate Election Winner

Platform comparison

Market context

Incumbent Lindsey Graham won the Republican nomination in June but died in office on 11 July, triggering a special primary on 11 August to select his replacement before the 3 November general election. The Democratic nominee is pediatrician Annie Andrews, who secured 61.5% of her party’s primary vote. This sudden vacancy has reset the race in a state that has not elected a Democrat to the Senate since 1994, yet the crowd-implied 20% probability for a Democratic win reflects both Andrews’ strong primary performance and the uncertainty surrounding the new Republican candidate.

Historically, South Carolina’s Senate races have been heavily Republican, with the party winning every general election since 1980. Comparable cases of incumbent death mid-cycle, such as the 1970 death of Senator John Stennis’s rival or the 2018 Alabama special election following Jeff Sessions’ resignation, show that replacement candidates often face initial weakness but consolidate quickly if the party machinery remains intact. However, Andrews’ 61.5% primary margin and Graham’s 56.8% win suggest a more competitive field than usual, though the 20% probability still aligns with the state’s long-term partisan lean.

Traders should monitor the 11 August Republican special primary, where Mark Lynch, who came second in June, is confirmed to run, alongside other potential contenders. The timing of Lynch’s formal announcement and fundraising disclosures will be critical, as well as any shifts in national Democratic messaging toward Andrews. A recent NBC News report noted Graham faced well-funded challengers before his death, suggesting Lynch may inherit significant backing, though the outcome remains dependent on voter turnout and campaign momentum through October [3].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews South Carolina Senate Election Winner across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Today, which mirrors the Polymarket order book at 0% fees.

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

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 does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

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 Today 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.