Trader consensus currently positions Robert F. Kennedy Jr. as the leading contender for the 2028 Republican presidential nomination, reflecting his high-profile administration role and crossover support built during the prior cycle. J.D. Vance ranks second, supported by his vice presidential tenure and established ties to party networks. Marco Rubio and Ron DeSantis follow with smaller shares, shaped by their Senate and gubernatorial records as potential primary options. These implied probabilities incorporate factors such as early-state positioning, endorsement patterns, and post-midterm party dynamics, with traders assessing paths through conventions and ballot access rules. Scheduled primary timelines and legislative activity through 2027 could further adjust positioning.