Marco Rubio leads trader consensus for the 2028 Republican vice presidential nomination at 29.5% due to his high-profile role as Secretary of State, which has elevated his national visibility through diplomatic engagements and foreign policy developments. With J.D. Vance positioned as the early presidential frontrunner, market pricing reflects speculation around a complementary Vance-Rubio ticket, reinforced by Trump’s past comments and Rubio’s statements prioritizing his current duties over a presidential bid. Other contenders trail significantly, differentiated by factors such as state executive experience, Trump family connections, or strong MAGA alignment, but lack Rubio’s combination of Senate tenure, cabinet stature, and cross-faction appeal. Consolidation behind one outcome could hinge on post-midterm endorsements, ticket chemistry signals, or shifts in the presidential field.