Vice President JD Vance holds a commanding lead as the consensus frontrunner for the 2028 Republican presidential nomination, reflected in his 95.5 percent implied probability of topping prediction market odds on October 31. His position draws from consistent national polling averages showing double-digit margins over rivals, his role as Republican National Committee finance chair, and early signals of support from President Trump. Secretary of State Marco Rubio trails as the clearest alternative but has publicly indicated no plans to challenge him. Other contenders including Donald Trump Jr., Ron DeSantis, and Tucker Carlson register minimal support. Late shifts could arise from midterm election results, changes in Trump’s public stance, or unexpected polling movements in early primary states before November.