Differences between Democratic voting bases in CA and MA

[Brittain33]

Why was MA-2 an easy win for Sanders but CA-39 and CA-47 were losses for him?

I'm confused. What is the rationale for making a comparison between those districts?

MA-2 is not affluent, not diverse, is close to Vermont, and includes some very white liberal centers in the Five Colleges area. It is mostly rural and small-town other than the city of Worcester. I don't see any kinship with either of the CA districts you mention—which are also not very similar to each other.

[Brittain33]

What is the reason Bernie Sanders easily won the primary in Northampton and Amherst MA, but lost Hacienda Heights, CA; and Long Beach, CA was very competitive?

In California, I think the primary may have split more on income than race. Bernie won the most diverse city in America, Oakland, but badly lost the rich mostly white city of Piedmont that it surrounds.

Similiarly, Bernie won Xavier Becerra's almost entirely Hispanic district in LA, while getting annihilated in the mostly white Santa Monica district.

How bad was turnout in Becerra's district, I wonder?