This is the first I’ve heard about this but the NH seacoast has never been part of the rest of NH. It’s always been where Boston libs meet Maine libs. For the most part.
Having gone to public school in NH I am not surprised. How could anyone willingly put their kid in a US public school?
Ten years ago we were one of the reddest of the red states. Now... see tag line.
don’t forget about Concord and Manchester. They’re even more liberal.