The wide-open Democratic vice-presidential market for 2028 stems from the lack of a confirmed presidential nominee nearly two years before the convention, leaving trader consensus fragmented across dozens of names. Alexandria Ocasio-Cortez leads at 11% on her progressive base mobilization and national profile, while governors such as Gretchen Whitmer draw support from swing-state executive records and governing experience that could aid geographic or demographic ticket balancing. Other contenders gain from regional appeal, legislative visibility, or ideological positioning. Key differentiators include 2026 midterm results that may elevate or sideline figures, recent DNC primary calendar adjustments, and the eventual presidential nominee's preferences for coalition building. Consolidation behind any single outcome would likely require a clearer presidential frontrunner and post-midterm shifts in party dynamics.