The wide-open 2028 Democratic vice-presidential field reflects an unsettled presidential nomination contest, with no declared candidates and trader probabilities dispersed across more than two dozen names. Alexandria Ocasio-Cortez and Gretchen Whitmer lead at roughly 10% each because they combine high visibility with distinct factional appeal—AOC among progressives and Whitmer among swing-state governors—while Andy Beshear, Pete Buttigieg, and James Talarico follow closely on perceived general-election strengths or rising profiles. Key differentiators include geographic balance, ideological fit with the eventual nominee, executive versus legislative records, and demographic considerations that historically shape ticket construction. Support is unlikely to consolidate until after 2026 midterms, formal presidential entries, or sustained polling that clarifies frontrunners and narrows viable running-mate scenarios.