Looks like

Elizabeth Warren wants in.

In truth she has certain strengths, the local Hilaryistas will no doubt rally to her cause, they still constitute a powerful faction within the state democratic party.
Citizen Warren has name recognition along with a record in politics that is short, mostly administrative and perhaps difficult to stereotype.
It can be of no small advantage in this economy to be perceived from the git-go as a fervent opponent Wall Street and The Banks.
I suspect she can fundraise and possibly develop a strong out of state cash flow a'la Scott Brown.
In sum, this is pretty much as close as John Walsh is gonna get to an answer to his prayers.
That having been said...
Elizabeth Warren is new to the game, she might be able to step up or she might auto destruct, there is no way to know til she piles in.
And all hope aside, the glass ceiling in state politics is as thick as ever, Citizen Warren had better have a plan to deal with it or at least some acknowledgement that the damn thing exists to start.
Lastly she has to wind her way thru a contested democratic primary and that is a situation that doesn't always advantage high name recognition candidates, just ask Tom Reilly if'n you don't believe me.
Still..."Marry in Massachusetts" went to one of the events on her listening tour and seems to have come away impressed.
Well all I can say (Romantic) Arlington has some of the biggest democratic primary turn out in the state, Citizen Warren might wanna drop on by to "Meet the Spartans".