And Massachusetts isn't NY or California. Osmosis doesn't really happen all that much in presidential races. If it did, Mondale would have won at least four more states.
Barring another Trump nomination disaster, the GOP nominee will capture the same states as Romney and McCain, and will gain 30+ to 50+ electoral votes. If it's that close, where a GOP nominee is up to 250-260 electoral votes, chances are more states will be in play elsewhere.
That's another of the Dem's major problems: they adhere to a model that is 40/50/60/70 years old. I love collective bargaining, but pining for a resurrection of big labor is something that should be left to the obscure books of academics in the social sciences.
Many of those former union voters are precisely the types the Dems have lost, again, because of the Dem's positions on "social issues."