Marco Rubio leads Republican VP nominee markets for 2028 at 24.5% amid ongoing speculation that the presidential ticket will pair him with Vice President J.D. Vance, whose own presidential odds have slipped while Rubio's have risen in parallel polling and prediction platforms. President Trump's public comments floating a potential Vance-Rubio pairing, including audience polls at events, have reinforced trader focus on these two figures as the core of any succession dynamic. Joe Kent's 16% share reflects support among voters prioritizing strict immigration and America First positions, while lower-priced names like Kristi Noem and Marjorie Taylor Greene capture narrower factional interest. The field remains fragmented because the eventual presidential nominee remains unsettled ahead of 2026 midterms and state-level positioning, with separation likely to emerge from Senate confirmation records, primary endorsements, or shifts in Trump's explicit preferences.