MI-13 Democratic Primary Winner

Platform comparison

Market context

The Democratic nominee for Michigan’s 13th congressional district will be decided in the August 4 primary, and the market’s 19% implied probability is effectively a live read on how plausible an upset or late-breaking uncertainty looks rather than a settled race. In 2024, Shri Thanedar won the district’s Democratic primary, while the district itself has remained safely Democratic, so primary dynamics matter more here than general-election fundamentals.[2] Current market and polling signals point to a narrowed contest between Thanedar and Donavan McKinney, with recent odds feeds showing McKinney ahead and Thanedar well behind, which helps explain why a sub-20% implied price can still be consistent with a competitive but one-sided trader book.[1][3][10]

For programmatic trading, the main inputs are not national swing factors but ballot finality, candidate-status changes, and official nomination timing. The market resolves to the Democratic nominee chosen by the party’s official sources, and if no nominee is announced by November 3, 2026, it resolves to “Other”; any replacement after nomination does not alter settlement, so bots should distinguish between *nomination*, *ballot access*, and *post-primary substitution*.[3] The practical catalysts are the Michigan primary result itself, any last-minute disqualifications or withdrawals, and confirmation from party or official election channels; recent reporting has already highlighted a two-candidate race after disqualifications, which is exactly the kind of event that can force abrupt repricing in copy-trading and conditional-order systems.[1][12][14]

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 Polymarket Review UK, which mirrors the Polymarket order book directly.

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

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 Polymarket Review 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.

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.