Here's the 2016 Massachusetts swing map (courtesy of realisticidealist):
There are bits of pink in central Hampshire and Hampden and the more successfully Toriefied parts of the Berkshires (mostly in the south, but look at Williamstown!), and (as I would have predicted) the area immediately to the north of Amherst and Northampton* is in the lightest shade of blue and probably
trended towards Clinton for the most part--I know for a fact that Conway and Deerfield did. The areas north and south of the Quabbin, on the other hand, and most of the north Berkshires (even North Adams, which is allegedly on the right track), and the Hill Towns above the Pioneer Valley proper, and the more downscale suburbs of Springfield, are...yeah.
(Erving, the deepest blue a couple towns to the east of Greenfield, still has a working paper mill; I'm not sure quite what the dynamic there is.)
*This area is probably the single most ALATT rural area in the country, and is the source of most of the stereotypes about Western Mass.
