Gubernatorial races are least tied to party/ national environmental as a whole. Charlie Baker is the most popular Governor in the county as a Republican with approvals in the low 70s in a state in which only 10% of people are registered Republicans
Well, he is VERY different from Congressional Republicans. May be - that's the reason of his popularity?
New England Republicans in general are a different beast than your traditional national Republican.
Less so, of late. Look at New England state legislatures - most Republicans there are more or less standard moderate conservatives or, sometimes, even "pure conservatives" (with exception of Connecticut, where substantial number of moderates still exist). Sometimes it puzzled me, that ACU frequently rates New England Republican legislators much higher then their Southerm brethern.