Elizabeth Warren's exploratory committee

(Photo Credit: AP)

Elizabeth Warren's Senate exploratory committee is now live.

The website -- www.ElizabethforMA.com -- allows supporters to sign up for updates and contribute financially.

The committee brings the consumer advocate one step closer to an official Massachusetts Senate campaign launch, which is expected shortly after Labor Day.

Warren is currently on a tour of house parties and meetings with progressive activists. She was in Lexington, New Bedford and Brockton on Wednesday and will be heading to Framingham, Shrewsbury, Falmouth, Springfield and Pittsfield next, according to an aide.

An adviser says Warren is drawing between 40 and 80 attendees per gathering.

One attendee tells POLITICO that Warren is clearly trying to prove to grass-roots Democrats that "we don't have to worry about her pulling a Coakley," referring to the attorney general, who lost to Scott Brown in 2010.

"She'll be comfortable campaigning anywhere in the state," said the source, who attended her meeting in Dorchester earlier this week.