I agree. I lived there for many years, got my Bachelors from UNH. Left in 1986.
It was always a very conservative state when I lived there.
But like many conservative states with low taxes (almost nonexistent in fact) like MA, liberals flee their state, then begin to impose their social and fiscal views on others. Their population grows and they start voting in Democraps.
Nowadays, you have MA liberals moving in next to farms up there, then after living for a year or two and saying nothing, start complaining about dust and the smell of fertilizer.
If u want to know what's turning NH liberal look at the New Yorkers and Vermonters moving there. Luckily, we have free staters fighting their socialist takeover.