Maine Democratic Senate nominee on July 27?

Platform comparison

Market context

The real-world event driving this market is Graham Platner’s sudden suspension of his Maine Senate campaign on 8 July 2026 following a sexual assault allegation, which triggers the Maine Democratic Party’s legal right to appoint a replacement nominee by 27 July 2026[1][2]. In prediction markets, a YES share pays out if the specified outcome occurs—here, that the party’s apparent nominee on 27 July is someone other than Platner—while a NO share wins if Platner remains the nominee or no replacement is formally selected[3]. The current 1% crowd-implied probability for YES reflects the market’s view that Platner is still technically the nominee unless the party officially announces a successor, despite his withdrawal intent[1].

Historically, similar late-stage candidate withdrawals in US Senate races have led to rapid party conventions, yet the outcome often hinges on whether the incumbent party chair controls the selection process[5]. In Maine’s 2026 case, Party Chair Charlie Dingman has already approved a nominating convention to fill the vacancy, suggesting a replacement is likely before the 27 July deadline[1][9]. Comparable cases, such as the 2018 Maine gubernatorial race where a candidate withdrew post-primary, show that parties can replace nominees within weeks if state law permits, though the exact candidate remains uncertain until the convention concludes[4].

Traders should monitor three key catalysts: the formal date of Platner’s withdrawal paperwork (deadline 13 July), the Maine Democratic Party’s convention schedule, and any official announcement naming the new nominee[1][5]. Recent reports confirm that over six potential alternatives have already stepped forward, indicating active scrambling within the party[4][10]. The critical dependency is whether Dingman’s convention yields a named candidate before 27 July 5:00 PM ET, as state law mandates replacement by that time[2][3]. Without an official announcement, Platner remains the apparent nominee, keeping YES probability low despite his campaign suspension[1].

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 Prediction Market UK, which mirrors the Polymarket order book directly.

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.

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.

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.