JD Vance holds the highest implied probability in this early 2028 presidential market at 20.8 percent due to his vice presidential role and consistent leads in Republican primary polling, yet the field remains fragmented with no major candidate declared. On the Democratic side, Alexandria Ocasio-Cortez, Jon Ossoff, Gavin Newsom, and Kamala Harris cluster in the 4–13 percent range amid shifting primary polls and positioning statements, including Newsom’s pledge not to run against Harris and Ocasio-Cortez’s recent comments weighing a bid after the 2026 midterms. Trader consensus reflects uncertainty over midterm outcomes, potential late entrants, and primary dynamics that could consolidate support or elevate alternatives like Josh Shapiro or Pete Buttigieg before formal campaigns begin.