Marco Rubio leads the Republican VP nominee 2028 market at 29.5% due to his prominent role as Secretary of State, which has elevated his national profile through diplomatic engagements and foreign policy visibility within the Trump administration. Current Vice President J.D. Vance trails at 5.5% as traders price in his stronger positioning for the presidential nomination instead, consistent with polling trends showing the two as leading contenders for the top of the ticket. The fragmented field, with no other name above 7%, reflects divided support across Senate, House, gubernatorial, and media figures, where factors such as prior elected experience, alignment with party factions, and perceived ticket-balancing potential could consolidate backing if early presidential frontrunners decline or shift focus.