PORTLAND, Maine -- Republican Sen. Susan Collins hasn't officially announced whether she's seeking reelection. But that isn't stopping campaign dollars from pouring into Maine.
Observers predict the race will set a spending record in the state.
Advertising data shows Democrats plan to spend at least $1.2 million on ads through December. A newly formed GOP group, meanwhile, has $800,000 already in the bank, thanks to a small group of wealthy financiers.
Collins has at least two Democratic challengers: House Speaker Sara Gideon and 2018 gubernatorial candidate Betsy Sweet.