Republican Presidential Nominee 2028

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Active sub-markets

Market context

The underlying event is whether a specific individual wins and formally accepts the 2028 Republican Party nomination for US president, a contract currently implying only a 2% chance of success. This figure diverges sharply from broader prediction-market data where Marco Rubio leads at 53% in Pennsylvania markets and JD Vance trails at 47%, while New York markets show Vance at 19% and Rubio at 17%[1][2]. Such regional inconsistency mirrors historical precedents where early primary odds fluctuated wildly before consolidation, suggesting that current low probabilities may reflect a specific candidate’s lack of traction rather than a systemic market failure for the entire nomination pool.

Traders must monitor the March 7, 2028 primary date and any formal announcement schedules from top contenders like Vice President JD Vance and Marco Rubio, who top the early list of potential nominees[3]. Party insiders expect a test of voter appetite for an alternative to President Trump’s conservatism, meaning any surprise entry or withdrawal could drastically shift implied probabilities[3]. Recent polling aggregates from Race to the WH and 270toWin offer the most reliable dependencies for tracking momentum, as these platforms update continuously with state-level leader data that often precedes national odds adjustments[5][7].

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). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Where can I trade this market with the lowest fees?

On PolyGram, which mirrors the Polymarket order book at 0% fees. 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.

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.

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.