With all precincts reporting, this is what last night's election results look like on a town-by-town basis (click image for larger version):
And Dave Wasserman tweets:
Q: Where are the other potential Dem collapse areas this Nov? A: Almost precisely the places Hillary carried in the 08 prez primary
He's definitely on to something. Below is a map of the 2008 presidential primary results in Massachusetts between Hillary Clinton and Barack Obama. Red is Clinton, blue is Obama:
The results between last night's race and the presidential primary correlate at a rate of 0.56, which is quite high.