Subtraction, not addition, is emerging as the central threat to Republicans in the 2026 election. The subtraction risk for Republicans is the prospect that President Donald Trump’s slipping approval rating among his 2024 voters will cause meaningful components of the coalition that elected him to sit out November’s midterms. Polls suggest that’s a greater danger for the GOP than the possibility that Democrats will add a big cache of new votes — either by turning out many people who did not participate in 2024, or by convincing a significant share of 2024 Trump supporters to vote blue.