High-stakes competition for House control in the November 2026 midterms, viewed as a referendum on the Trump administration, is sustaining elevated engagement expectations among traders. Narrow Republican majorities, Democratic polling advantages, special election overperformance by Democrats, and ongoing redistricting battles have nationalized the contest, while primary turnout signals and youth registration trends point to stronger mobilization than typical off-year patterns. Historical midterm turnout of roughly 100-115 million votes, tempered by lower participation without a presidential ballot, anchors the market's clustering around 120-130 million as the leading range. Competitive districts, fundraising surges, and messaging on economic and policy issues could widen participation if enthusiasm gaps persist, whereas weaker base mobilization on either side might pull totals lower.