The Democratic edge at 64.5% reflects trader assessment of an open 2028 field where national primary polling shows Kamala Harris leading a fragmented Democratic lineup while JD Vance anchors a more consolidated Republican side yet trails in some general-election hypotheticals. Recent September 2026 surveys indicate modest shifts, with Alexandria Ocasio-Cortez gaining ground among Democrats and the overall race remaining fluid ahead of the 2026 midterms. Geopolitical developments, including U.S.-Iran tensions, have prompted minor repositioning in candidate-specific contracts without materially altering the broader party balance. Economic indicators through 2027 and primary calendar outcomes remain the primary scheduled catalysts that could reprice probabilities before formal nominations.