The 2028 presidential nomination contests remain wide open across both parties, with trader consensus reflecting a fragmented field where JD Vance leads at 20.8% but no single contender exceeds 21%. Early positioning after the 2024 cycle, including vice-presidential visibility and gubernatorial records, has kept probabilities dispersed among figures such as Alexandria Ocasio-Cortez, Jon Ossoff, Marco Rubio, and Gavin Newsom. The upcoming 2026 midterms, primary filing deadlines, and initial polling in early states represent the nearest catalysts that could consolidate support, while endorsement patterns, legislative votes on appropriations and border measures, and shifts in key voting blocs may further separate leading probabilities before formal delegate selection begins.