Dec. 12, 2025: Deep-pocketed groups are already spending on the Maine U.S. Senate race. Here’s an early guide

AdImpact, an organization tracking political ads, estimates the Maine Senate contest could help draw more than $300 million in spending on congressional races in the state next year. That’s nearly a third more than the record-smashing amount spent in 2020 when Republican U.S. Sen. Susan Collins secured her fifth term.