The wide-open Democratic vice-presidential field for 2028 reflects the absence of a confirmed presidential nominee more than two years before the convention, leaving traders assigning roughly 10% implied probability or less to any single outcome. Governors such as Gretchen Whitmer and Andy Beshear attract interest for their executive records and swing-state positioning, while figures like Alexandria Ocasio-Cortez and Pete Buttigieg compete on national visibility and ideological alignment within the party. Early presidential polling and DNC primary calendar adjustments highlight frontrunners including Kamala Harris and Gavin Newsom, whose eventual running-mate choice would likely consolidate support around complementary demographics or regional balance. Midterm results, candidate announcements, and convention dynamics remain the primary catalysts that could narrow probabilities ahead of 2028.