Maine Democratic Senate nominee on July 27?

Platform comparison

Market context

The real-world event driving this market is Graham Platner’s withdrawal from the Maine Senate race on 8 July 2026, following a sexual assault allegation that caused his Democratic allies to rescind endorsements. This exit clears the path for the Maine Democratic Party to appoint a new nominee before the 27 July deadline, with the market resolving on who that nominee is.

Historically, candidate withdrawals in tight Senate races—such as 2018 in Nevada or 2020 in Arizona—have led to rapid replacement processes, often via conventions, with new nominees emerging within two weeks. The current 1% YES probability reflects uncertainty over whether the party will confirm a nominee before the settlement window, not doubt about Platner’s exit, which is already confirmed[1][2].

Traders should monitor the Maine Democratic Party’s convention schedule, official nominee announcements, and any further legal or procedural dependencies. The party has already approved a nominating convention to select a replacement if Platner steps aside, and the two-week window to act is now active[1]. Recent reporting confirms the party is actively seeking candidates, with multiple Democrats expressing interest[9]. Programmatically, this market would be approached by setting conditional orders tied to announcement timestamps, using bots to scrape party communications, and executing copy-trading strategies once a nominee is publicly confirmed.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Maine Democratic Senate nominee on July 27? 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 Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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'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.

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 Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.