I would hope this CD, or at least another one in Mass., would be able to elect an unabashed liberal of the Frank mold. Massachusetts is pretty much one of the only states where a few CD's would elect one if a staunch liberal got through the primary.
Vermont, Left Coast, New York, and maybe Rhode Island would elect a Frank mold liberal to congress.
Yes, that's why I said "one of the only states". The thing about Mass. is that no matter how lines are drawn, there are several options. Even MA-3, conservative by Mass. standards, elects the quite liberal Jim McGovern.