Recent Republican midterm losses have fueled speculation about shifts in the 2028 GOP presidential field, with traders monitoring Marco Rubio’s positioning as Secretary of State. Vance leads most national polling averages and prediction markets, yet Rubio has narrowed gaps or led outright in several recent surveys amid questions over foreign policy accountability. Rubio has repeatedly stated plans to complete his term through January 2029 and declined to discuss a presidential bid, though reports of potential resignation gained traction after the elections before he publicly rejected them. President Trump’s recent comments praising Rubio while avoiding a firm endorsement of Vance have added uncertainty. With the December 31 resolution window approaching, any confirmation of Rubio’s intentions or further polling movement could influence implied probabilities reflected in trader consensus.