Vermont, New Hampshire, and Maine all used to be reliably Republican, but that very quickly changed in the 90s.
ME-02 is returning to swing district status.... and that's it! I'd say the women in the state got REALLY angry after the 2002 and 2004 Senate elections, when two Democratic women lost to two Republican men. Then it really started to change.
I'm not yet buying ME-02 trending Republican. It didn't show any kind of trend like that in recent elections. I guess we'll know more after this election. I think that part of the 1992 re-alignment was states with a lot of progressives (WA, OR, VT, NH, and ME) moving into the Democratic column. The flip side was states that are more socially conservative (AR, TN, KY, WV, and eventually MO) moved solidly into the Republican column starting in 2000.