Marco Rubio leads trader consensus for the 2028 Republican vice presidential nomination at 29.5 percent amid a fragmented field, reflecting his prominent role as Secretary of State and acting national security adviser, which has elevated his national profile through foreign policy engagements. J.D. Vance trails at 7 percent, consistent with widespread expectations that the sitting vice president will instead seek the presidential nomination, leaving room for ticket-balancing options. Recent positioning includes Rubio’s public statements deferring to Vance on a presidential bid while maintaining focus on his cabinet duties, alongside Trump’s past comments suggesting complementary pairings of the two. The broad distribution of remaining probabilities across Senate, gubernatorial, and media figures underscores early uncertainty, with consolidation likely to hinge on 2026 midterm results, administration signals, and any formal declarations clarifying the presidential field.