Democratic primary turnout has significantly outpaced Republican participation across key states through September 2026, signaling stronger opposition energy that aligns with the market's leading 115-120 million vote bin. This pattern echoes the high-engagement cycles of 2018, when total House votes reached approximately 118-122 million amid anti-incumbent sentiment, while recent expansions in mail and early voting have lifted structural baselines above 2014 lows. Low presidential approval, economic pressures, and competitive House districts further support trader emphasis on the 110-125 million range, though mobilization effectiveness in battlegrounds and final voter contact efforts remain key variables that could shift totals within the 30 days before Election Day.