J.D. Vance and Robert F. Kennedy Jr. remain tightly matched near 50 percent each in the Republican presidential nomination market, reflecting trader views of a contested path to 2028 amid the sitting vice president’s frontrunner status and the HHS secretary’s distinct constituency. Vance benefits from his position in the administration, early-state visibility, and alignment with the Trump-aligned coalition, though he has not formally declared and midterms could shape party dynamics. Kennedy draws support through his Make America Healthy Again emphasis and crossover appeal, with recent public appearances and administration role sustaining speculation about a potential bid. Other contenders such as Marco Rubio trail significantly, underscoring how endorsements, polling trends among Republican primary voters, and post-midterm positioning could widen or narrow the gap before formal declarations.