Elevated Democratic enthusiasm stemming from opposition to the Trump administration has produced stronger primary and special election participation than in 2022, particularly in competitive and even Republican-leaning districts, while youth registration trends and expanded mail voting infrastructure support a higher turnout floor. These factors, combined with a nationalized House contest featuring narrow majorities and ongoing redistricting, have led traders to cluster probabilities around the 115-130 million vote range. Typical midterm drop-off from presidential-year levels, uneven Republican base mobilization, and the absence of a top-of-the-ticket race continue to cap upside, keeping adjacent bins closely matched. Late-cycle developments such as shifts in generic ballot enthusiasm, major campaign spending surges, or last-minute voter mobilization efforts in battleground states could separate the leading outcomes before November 3.