Trader consensus for the 2028 Republican presidential nomination places Robert F. Kennedy Jr. at the front with an implied probability of 49 percent, followed by J.D. Vance at 31 percent and Marco Rubio at 18 percent. This distribution reflects assessments of candidate alignment after the prior election cycle, including Kennedy's crossover positioning and integration within Republican circles. Vance's standing draws from his vice-presidential experience and connections to the party's dominant faction, while Rubio benefits from Senate leadership and foreign policy credentials. The broader field remains fragmented, with lower shares for figures such as Ron DeSantis indicating limited early momentum. Key variables include upcoming midterm outcomes, primary filing deadlines, and shifts in coalition support across battleground states.