Marco Rubio leads trader consensus for the 2028 Republican vice presidential nomination at 29.5% due to his high-profile role as Secretary of State, which has boosted national visibility through diplomatic engagements and foreign policy developments. Current Vice President J.D. Vance trails at 5.5% amid speculation he may pursue the presidential nomination instead, consistent with polling trends showing the two competing for the top of the 2028 ticket. A fragmented field follows, with no other contender above 7%, reflecting divided support across Senate, gubernatorial, and media figures. Key differentiators include foreign policy experience, Senate tenure, alignment with America First priorities, and potential ticket-balancing appeal. Consolidation could occur via Trump administration signals, 2026 midterm outcomes, or early positioning that clarifies whether Vance runs for president.