Marco Rubio leads trader consensus for the 2028 Republican vice presidential nomination at 31.5 percent amid a fragmented field, driven by his high-profile role as Secretary of State and expanded diplomatic responsibilities that have raised his national visibility. Traders price in the possibility that the presidential frontrunner, Vice President J.D. Vance, secures the top spot and pairs with Rubio as a complementary running mate, consistent with past ticket-building patterns and public comments from party figures. Other contenders trail with single-digit shares due to narrower regional bases, limited executive-branch exposure, or positioning as presidential alternatives. Key differentiators include Rubio’s Senate and cabinet record versus challengers’ legislative or gubernatorial profiles; support could consolidate behind one outcome through endorsements from the eventual presidential nominee, strong midterm performance by aligned candidates, or shifts in administration priorities before the 2028 convention.