Why is Vermont so liberal nowadays?

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I don't find the "shift of the GOP" argument alone satisfactory, since it doesn't explain why only Vermont has swung to such an extreme degree. Vermont has gone from being the most Republican state to possibly the most Democratic.

Perhaps it is accustomed to being homogeneous in its voting patterns.

Being small and ethnically homogeneous breeds some rather homogeneous and insular voting patterns.

At any rate, the "transplants from MA and NY" moving in is a rather crappy one.