JD Vance leads 2028 Republican primary polling at roughly 35-40 percent and prediction markets at around 50 percent, with Marco Rubio a distant second and no woman appearing in the top tier of contenders. Potential female candidates such as Nikki Haley, who has stated she will not run, Elise Stefanik, Kristi Noem, and Sarah Huckabee Sanders register individual nomination odds below 5 percent on major platforms and trail significantly in surveys. The Republican Party has never selected a woman as its presidential nominee, and the current field composition plus absence of recent polling surges or major endorsements for female contenders underpin trader consensus on a male nominee. Late developments including candidate withdrawals, strong midterm performances by women, or unforeseen shifts in party coalitions could still alter the outcome before the 2028 convention.