Marco Rubio leads trader consensus for the 2028 Republican vice presidential nomination at 29.5 percent amid a fragmented field where no other contender exceeds 6 percent. As Secretary of State, Rubio benefits from high visibility in the Trump administration, Senate experience, and foreign policy credentials that position him as a potential balance to frontrunner J.D. Vance, who dominates 2028 presidential markets. Recent polling of Republican voters shows Rubio as the preferred running mate over alternatives like Ron DeSantis or Nikki Haley, reflecting preferences for institutional continuity and broader electoral appeal. Consolidation behind one outcome would likely require endorsements from party leaders, strong midterm results, or shifts in the presidential race that clarify ticket dynamics before formal selection at the convention.