Hidden Lean regression (towns, weights = 2024 President two-party votes, n = 503):
  expected raw vote margin = -6.37 + 150.96 x (active Democratic share) + -116.49 x (active Republican share)
  shares as fractions of active voters, Nov 5, 2024. Weighted R2 = 0.944; residual sd (weighted) = 6.76 points.
