**Vance remains the clear frontrunner for the 2028 Republican presidential nomination, with Rubio positioned as a distant second and explicitly stating he has no plans to run.** As sitting vice president, Vance benefits from the institutional advantages of the office, strong grassroots alignment with the MAGA base, and repeated public signals of support from President Trump. Recent polling shows Vance leading Rubio nationally and in early states, though the margin has narrowed in some surveys since earlier in the year. Rubio, serving as secretary of state and acting national security adviser, has focused on his administration roles and deferred to Vance in public comments. At the September 2026 Republican midterm convention in Dallas, Vance received prominent speaking time and enthusiastic backing from attendees, reinforcing his status as the presumptive heir. No major developments in the past month—such as shifts in Trump’s positioning, new polling surges for Rubio, or changes in Rubio’s intentions—indicate an imminent reversal of their relative standing. With only weeks until the October 31 cutoff, traders view a Rubio-led flip as improbable given the short timeline and Vance’s entrenched advantages in party support and visibility.