Home/Compare Markets/Republican Presidential Nominee 2028 ✓ 98% matchpolitics2028 Republican Presidential Nominee 2028: Polymarket vs Kalshi 46 outcomes|2 platforms Trade on Polymarket Details resolves by Nov 7, 2028 Trade on Kalshi Details resolves by Nov 7, 2028 ⛓️ Also trading on Predict.fun Compare the odds on another venue Open on Predict.fun → Total Volume $736.38M Liquidity $93.00M Avg Spread 0.4pp Max Spread 2.9pp Both platforms converge on J.D. Vance as the frontrunner at roughly 40-41%, but Kalshi prices Marco Rubio 5 percentage points higher than Polymarket (30% vs. 25%), suggesting the regulated U.S. exchange sees greater viability in Rubio's recent surge in Republican polling and National Security Council positioning. Kalshi similarly overweights alternatives like Trump Jr.

Analysis written Jul 8, 2026 odds in the tables below are live ▸ Show full contract ladder & live odds (46 rungs)▾ Hide full contract ladder Cross-Platform Odds Comparison Outcome Polymarket Kalshi Spread J.D. Vance 43%—Buy 41%+2.0Buy 2.0pp spread Marco Rubio 27%±0Buy 30%±0Buy 2.9pp spread Ron DeSantis 3%—Buy 5%±0Buy 2.4pp spread Donald J.

Trump

Jr. 1%±0Buy 4%±0Buy 2.6pp spread Donald J. Trump 2%±0Buy 3%±0Buy 0.6pp spread Tucker Carlson 2%±0Buy 2%±0Buy 0.8pp spread Glenn Youngkin 1%—Buy 1%±0Buy 0.1pp spread Thomas Massie 1%—Buy 1%±0Buy 0.7pp spread Ivanka Trump 1%—Buy 1%±0Buy 0.4pp spread Ted Cruz 1%—Buy 1%±0Buy 0.3pp spread Bezos 1%±0Buy L Lara Trump 1%±0Buy S Spencer Pratt 1%±0Buy Marjorie Taylor Greene 1%—Buy 1%±0Buy 0.5pp spread Vivek Ramaswamy 1%—Buy 1%±0Buy 0.6pp spread Brian Kemp 1%—Buy 1%±0Buy 0.3pp spread Josh Hawley 0%±0Buy 1%±0Buy 0.4pp spread Greg Abbott 1%—Buy 1%±0Buy 0.2pp spread Candace Owens 0%—Buy 1%±0Buy 0.8pp spread Rand Paul 1%—Buy 1%±0Buy 0.2pp spread Robert F.

Kennedy

Jr. 1%—Buy 0%±0Buy 0.3pp spread Tulsi Gabbard 1%±0Buy 1%±0Buy 0.1pp spread Sarah Huckabee Sanders 1%—Buy 1%±0Buy 0.1pp spread Elon Musk 1%—Buy 0%±0Buy 0.4pp spread Byron Donalds 1%—Buy 0%±0Buy 0.2pp spread Steve Bannon 0%—Buy 1%±0Buy 0.1pp spread Joe Kent 0%—Buy - - Erika Kirk 0%—Buy 1%±0Buy 0.1pp spread Pete Hegseth 0%—Buy 0%±0Buy 0.1pp spread Kim Kardashian 0%—Buy - - Mike Pence 0%—Buy 0%±0Buy 0.1pp spread Katie Britt 0%—Buy 0%±0Buy 0.1pp spread Nikki Haley 0%—Buy 0%±0Buy 0.1pp spread Elise Stefanik 0%—Buy 0%±0Buy 0.1pp spread Eric Trump 0%—Buy 0%±0Buy 0.2pp spread Tom Cotton 0%—Buy 0%±0Buy 0.3pp spread Tom Brady 0%—Buy - - Matt Gaetz 0%—Buy 0%±0Buy 0.1pp spread N Nicki Minaj 0%±0Buy John Thune 0%—Buy 0%±0Buy 0.1pp spread Kristi Noem 0%—Buy 0%±0Buy 0.1pp spread Mike Johnson 0%—Buy - - Doug Burgum 0%—Buy - - Tim Scott 0%—Buy - - Rick Scott 0%—Buy - - John N. Kennedy 0%—Buy - - Arbitrage Prospect 2.9pp spread Marco Rubio Buy YES 27%onPolymarket + Buy NO 70%onKalshi Cost: 97¢ per pair → pays $1 at resolution. Gross spread 2.9pp — before fees, and only at the top of what may be a thin book; both platforms charge trade fees and capital locks up until the market resolves, so the executable edge is usually smaller (often zero).

View all arbs Biggest Trades Across Platforms All whale trades → kasell anonymouson J.D. Vance 59¢$29.5KJul 13 pobuy Celestialaon Steve Bannon 99¢$20.0KMar 24 kasell anonymouson J.D. Vance 60¢$20.0KJul 14 pobuy alkyrieon Kristi Noem 99¢$20.0KMar 25 pobuy alkyrieon Steve Bannon 99¢$19.9KMar 24 posell Celestialaon Steve Bannon 99¢$17.8KMar 25 pobuy alkyrieon Byron Donalds 100¢$16.8KMar 22 posell Jsramon J.D.

Vance 63¢$16.3KApr 5 pobuy Dagerqon Tom Brady 99¢$16.1KApr 1 pobuy iyfgcgon Robert F.

Kennedy

Jr. 99¢$15.8KMar 16 The 2028 Republican Primary Landscape Background, methodology, and platform context Compare Republican Presidential Nominee 2028 prediction market odds side by side across Polymarket, Kalshi. Platforms show similar odds, with an average spread of just 0.4pp. Close agreement often signals strong market consensus.

With $736.38M in combined trading volume across 46 outcomes, this is one of the most actively traded cross-platform prediction markets. The Republican primary race for 2028 marks the first post-Trump cycle with mature prediction market infrastructure. JD Vance, Ron DeSantis, and other figures are being priced by thousands of traders putting real money behind their assessments.

The result is a continuously updating probability that aggregates insider knowledge, polling data,



and political analysis into a single metric. Cross-platform spreads between Polymarket and Kalshi on Republican primary outcomes can be particularly informative. Polymarket draws international traders who may weight different factors than Kalshi's domestic-only user base.

When the spread widens, it often reflects divergent views on whether a candidate's appeal is primarily domestic or global—a meaningful distinction in an increasingly interconnected political landscape. The primary process typically generates more price volatility than the general election. As candidates declare, debate, and compete in early state contests, prediction markets will be the fastest-updating forecast available.

PredictMarketCap tracks these shifts across platforms so you don't need to check Polymarket and Kalshi separately. 2028 Election Center →General Election Odds → Descriptions normalized for comparison (outcome names replaced with [OUTCOME]) Highlight differences Polymarket This market will resolve to “Yes” if [OUTCOME] wins and accepts the 2028 nomination of the Republican Party for U.S. president. Otherwise, this market will resolve to “No”. The resolution source for this market will be a consensus of official Republican Party sources.

Any replacement of the Republican nominee before election day will not change the resolution of the market.

Kalshi

If [OUTCOME] wins and accepts the nomination for the Presidency for the Republican party in 2028, then the market resolves to Yes. AI Analysis Moderate Match (64%) Different platforms may use different resolution criteria, data sources, and settlement timelines.

Polymarket

Volume $681.89M Liquidity $55.86M Trade Details Kalshi Volume $54.49M Liquidity $37.14M Trade Details Spread Analysis Marco Rubio Kalshi higher than Polymarket 2.9pp 30% vs 27% Donald J.

Trump

Jr. Kalshi higher than Polymarket 2.6pp 4% vs 1% Ron DeSantis Kalshi higher than Polymarket 2.4pp 5% vs 3% Markets matched across platforms with 98% confidence. This match has not been human-verified. Odds and spreads update every 30 minutes.

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