**As of late August 2026, no major-party contenders have formally announced 2028 presidential bids, leaving trader consensus heavily weighted toward figures already testing the waters through polling, travel to early states, and public statements.** JD Vance, positioned as the Republican frontrunner in prediction markets and polls, commands the highest implied probability of announcing before the end of 2027 due to his role as sitting vice president and consistent signals of succession positioning. On the Democratic side, open-field dynamics favor governors and senators such as Gavin Newsom, Andy Beshear, Jon Ossoff, and Alexandria Ocasio-Cortez, with recent activity including Van Hollen’s “kicking the tires” comments, Ocasio-Cortez rejoining the DSA, and Buttigieg describing himself as “more inclined than not.” Minor candidates like Dan Greaney and Royce White have filed, but the market’s focus remains on high-profile names whose exploratory steps and post-2026 midterm timing could trigger formal entries. The November 2026 midterms and any shifts in primary-calendar rules represent the clearest near-term catalysts.