2028 Republican Nominee: Odds & Probability

Prediction markets on who will secure the 2028 Republican presidential nomination have attracted more than $673 million in trading volume, making it one of the most heavily wagered political events. The contracts resolve based on whether a named individual wins and accepts the nomination; a later replacement before election day would not alter the outcome. The frontrunner is Robert F. Kennedy Jr., with a 49% probability. J.D. Vance follows closely at 41.5%, and Marco Rubio comes third at 28%. No other candidate reaches 4%. The steep drop after the top three—Tucker Carlson (3%), Ron DeSantis (2.5%), Donald Trump (1.7%)—shows that traders see a clear break between a small group of plausible nominees and everyone else. Beyond that, a handful of figures including Vivek Ramaswamy and Donald Trump Jr. sit at 1.3%, while Glenn Youngkin, Ivanka Trump, and several others are at 1.1%. The rest fall to 0.9% or lower, with more than twenty additional names trading at 0.8% or below. Because each candidate trades as a separate contract rather than in a single pooled market, the probabilities do not sum to 100%. A Kennedy contract at 49% and a Vance contract at 41.5% can coexist without contradiction. Traders are effectively pricing the standalone chance of each person, not the relative odds in a zero-sum contest. Interpreted loosely, the numbers suggest the market sees roughly an 80–90% chance that the nominee will be either Kennedy or Vance, with Rubio as the main alternative. A curious detail: a second market for Robert F. Kennedy Jr. appears with a price of just 0.8%. This is almost certainly a thinly traded or erroneous listing, given the stark contrast with the main market. The resolution rules are specific: the market triggers on the individual winning and accepting the nomination. If that person later withdraws or is replaced as the party’s general-election candidate, the “Yes” outcome stands. This design focuses the bet on the convention outcome rather than the November ballot. The low probabilities assigned to once-prominent Republicans like DeSantis and Trump reflect a market that does not yet see a path for them. Even Donald Trump commands only a 1.7% chance. Whether that assessment will hold as the primary season approaches is an open question, but for now, the money is clearly on Kennedy and Vance. The total volume of $673 million signals deep engagement. The market will likely fluctuate as political developments unfold, but the current pricing offers a snapshot of collective expectations.