Vice President JD Vance maintains a consistent lead over Secretary of State Marco Rubio in national polling averages and prediction markets for the 2028 Republican presidential nomination, with Vance typically at 40 percent or higher support and Rubio in the mid-20s or below. Rubio has narrowed gaps in select early-state surveys amid his high-profile diplomatic role, yet recent reporting indicates his advisers view him as deferring to Vance should the vice president seek the nomination. President Trump has described Vance as the likely successor while noting both men positively, with no formal candidacies declared ahead of the November midterms. Trader consensus prices a Rubio overtake by October 31 as highly improbable given the timeline and current positioning. Late-breaking developments such as a major foreign policy shift or unexpected Trump statement could still alter momentum before the deadline.