Jon Ossoff has risen to the top of prediction market pricing for the 2028 Democratic presidential nomination following his strong reelection performance in Georgia during the 2026 midterms, with traders assigning him roughly 26-27% implied probability ahead of Alexandria Ocasio-Cortez and Gavin Newsom. The wide-open contest features no formal declarations yet, leaving room for shifts driven by fundraising totals, early-state travel, and positioning on issues such as affordability and party direction. National primary polling shows more variability, with Kamala Harris often leading while markets emphasize recent electoral momentum and name recognition. Key upcoming catalysts include potential candidate announcements in the first half of 2027, donor events, and any early polling or endorsement moves that could reprice probabilities ahead of the March 31 resolution window.