The high-stakes contest for House control, widely viewed as a referendum on the Trump administration, has nationalized the race and sustained elevated engagement expectations. Traders assign the highest probability to 115-120 million total House votes, reflecting Democratic primary turnout advantages in multiple states, stronger expressed enthusiasm among Democrats, and early voting ballot request patterns favoring the out-party in key states. Historical midterm totals of roughly 100-115 million votes provide the baseline, while narrower Republican majorities, redistricting effects, and competitive districts could widen participation if enthusiasm gaps persist. Mixed youth registration trends and funding shortfalls for some voter mobilization groups introduce downside risks that keep lower bins priced modestly.