Marco Rubio leads trader consensus for the 2028 Republican vice presidential nomination at 29.5% primarily due to his elevated profile as Secretary of State and acting national security adviser, where diplomatic engagements and foreign policy responsibilities have enhanced his visibility and perceived fit for ticket balancing. Current Vice President J.D. Vance sits at 5.5% amid positioning as the leading presidential contender, consistent with polling trends separating the two for the top of the ticket. A fragmented field with no other name above 7% reflects divided support among Senate, gubernatorial, and media figures. Key differentiators include foreign policy experience, Senate tenure, alignment with administration priorities, and donor networks. Consolidation could follow Trump administration signals, 2026 midterm results, or early positioning clarifying the presidential field.