The 2028 Republican presidential field currently centers on male frontrunners such as JD Vance and Marco Rubio, who lead early prediction markets and polling among party voters. Nikki Haley ruled out a bid in April 2026, while other potential female contenders including Sarah Huckabee Sanders, Tulsi Gabbard, and Elise Stefanik register below 2% in related markets. This candidate composition and the absence of any woman building comparable support or endorsements sustain the 96% trader consensus against a female nominee. Late shifts remain possible if health events sideline leading candidates, party dynamics elevate an unlisted contender through primaries, or new announcements reshape the field before the convention.