Strongest state parties?

[Progressive Pessimist]

Democrats: Colorado, Georgia, Wisconsin.
Republicans: Florida, Ohio.

And even though they've gotten shut out of almost everything else, I do think the Massachusetts GOP deserves some credit for having won 6 out of the last 8 gubernatorial elections.

I think the Massachusetts GOP only deserves credit when the Democrats nominated Martha Coakley. Granted, that is indeed a demerit to the Massachusetts Democrats, especially after not learning after her loss to Brown.