The wide-open 2028 Republican vice-presidential field reflects an early stage in the cycle, with trader consensus pricing Marco Rubio highest at 29.5% amid his role as Secretary of State and established Senate record. Marjorie Taylor Greene and Brian Kemp follow at 15.6% and 11.6%, drawing support from strong base mobilization and gubernatorial experience respectively, while J.D. Vance sits at 7.5% tied to his current vice-presidential position. Other names such as Thomas Massie and Tulsi Gabbard highlight ideological and crossover appeal factors. Key differentiators include legislative tenure, state executive records, and alignment with party priorities on foreign policy and domestic issues. Consolidation behind one contender will likely hinge on the identity of the eventual presidential nominee, primary endorsements, and polling trends closer to the convention.