This picture was taken 17 days after the June primary election.
According to guidance on Maine.Gov
2. May be erected within the Right of Way limits of public ways no sooner than six(6) weeks prior to an election, primary or referendum and must be removed no later than one week following the date of the election, primary or referendum;
Senator Mills, here’s one of your signs.
The first hint is that this on a southern stretch, below the Airline.