Traders in political prediction markets are butting heads over the upcoming fate of the Republican Party.
Market data from prediction operator Kalshi shows that Vice President J.D. Vance leads all candidates with a 42% chance of winning the 2028 Republican nomination. However, the U.S. Secretary of State and Acting National Security Advisor, Marco Rubio, leads all Republicans and Democrats in probability of winning the 2028 election.
JD Vance favored to win the nomination
Vance had long been viewed as the heir apparent in the Oval Office once President Donald Trump completed his second term. He approached 60% when the market first opened in 2024 and spiked to 57% in Aug. 2025.
A controversial approach in Iran, combined with climbing prices back home, caused Vance to fall to an all-time low 31.3% on June 8, giving him just a 1.7% cushion over Rubio. Vance rebounded in the days since and is back up to his current value of 42%.
Despite Vance’s recovery, Rubio also improved his chances to a personal all-time high of 30%. He was only at 7.8% this time last year.
Florida Gov. Ron DeSantis (4.6%), businessman Donald J. Trump Jr. (4.1%), and Tucker Carlson (3.4%) represent the candidates who are hoping to close the gap between themselves and the contenders. DeSantis especially appears to be gearing up for a real push toward the nomination and the presidency, although he has a lot of distance to cover.
Marco Rubio the pick for president?
Vance and Rubio overtook each other once each within the last month in the 2028 presidential election prediction market. Rubio maintains a current value of 19%, 2% below his all-time high, while Vance sits at 17%, 1.4% above his all-time low. California Gov. and leading Democrat Gavin Newsom is third at 13%.
Conventional wisdom dictates that a Democratic President would replace a Republican, especially one as divisive as the incumbent, Trump. However, Newsom’s probability has slowly and steadily declined since it peaked at an all-time high of 23.9% last September.
Prediction markets are all about spotting opportunities. Traders may feel that taking Rubio at a lower price point in the presidential election market represents a greater investment opportunity than backing him for a larger fee in the Republican nomination market.
Still, it’s strange to see two related but impossible outcomes — Vance winning the Republican nomination and Rubio winning the election — leading Kalshi’s political prediction markets.
The Democratic challengers
Newsom was once a 37.1% favorite to represent the Democrats on the Presidential ticket in 2028. He fell to 21% and basically hasn’t moved within the last month.
U.S. Rep. Alexandrio Ocasio-Cortez (NY) sits second at 15%. She vaulted to a leading 24.8% from June 29-30, but quickly returned to her place behind Newsom.
U.S. Sen. Jon Ossoff (GA) is a surprising third-place contender. He only got on the board about one year ago, but he’s now at 13% and up from 8.6% one month ago.
The Trade Handle Prediction Markets Take
Rubio surged in popularity in the spring due to his involvement in America’s foreign policy. While the war in Iran is still ongoing, the Republican candidate who connects with voters on issues back at home will be in the best position by the time the next election takes place. Rising costs of living and jobs being lost to artificial intelligence are among two of the most pressing issues for the candidates to convince the public they know how to tackle.