JD Vance holds the top position in the 2028 winner market at 20.8% as the sitting vice president in an open contest, backed by consistent leads in national Republican primary polling averages around 39% and his role as RNC finance chair. No major candidates have declared yet, with the field expected to clarify after the November 2026 midterms. On the Democratic side, the absence of a dominant frontrunner fragments support across Alexandria Ocasio-Cortez at 13.2%, Jon Ossoff at 10.9%, Gavin Newsom at 7.6%, and Kamala Harris at 4.0%, reflecting early maneuvering and polling volatility where no name exceeds 25-38% in recent surveys. Recent September 2026 developments, including Vance’s keynote at a GOP midterm event and statements from figures like Newsom and Marco Rubio narrowing their paths, have reinforced this dispersed trader consensus without creating clear separation.