FiveThirtyEight gave Clinton a 94% chance of winning MA tonight, so a win for Sanders, even by a little bit, qualifies as an upset in my opinion.
I have said this whole time that I think Sanders will win MA. I live in one of the most liberal cities in the entire nation- the college voters here are very involved.
Here's hoping you're wrong about your people then.
massachusetts is quite possibly the most liberal state in the country (fun fact: over 50% of registered voters in boston are registered democrats, while less than 7% are republicans) so if bernie doesn't perform as well as expected there then that's a pretty bad sign for everywhere else.
There's a lot of liberals here that aren't quite liberal enough for Bernie, especially as you look at age demographics.