(CNN) - Saying "I'm going to do this. I'm going to run for the United States Senate," former Obama administration official, consumer advocate, and Harvard Law professor Elizabeth Warren officially launched her bid to try and unseat Republican Sen. Scott Brown of Massachusetts, who Democrats think may be one of the most vulnerable GOP senators in next year's election.
Warren will kick off her campaign at five stops across the Bay State Wednesday: Boston, New Bedford, Framingham, Worcester and Springfield. Using an outsider approach, Warren listed the reasons she's running in a video on her campaign website early Wednesday morning.
"Middle class families have been chipped at, hacked at, squeezed and hammered for a generation now and I don't think Washington gets it. Washington is rigged for big corporations that hire armies of lobbyists," Warren said. "We're telling seniors they may have to learn to live on less. It isn't right and it's the reason I'm running for the United States Senate."
Warren's announcement is anything but a surprise. She set up an exploratory committee in August and has spent the last few weeks traveling around Massachusetts on a "listening tour."
Warren is the eighth declared candidate in the race for next year's Democratic Senate nomination in Massachusetts, but none of the other contenders have strong name recognition and some national Democrats were concerned that none of the others would be able to effectively challenge Brown, who made national headlines by beating Democratic state Attorney General Martha Coakley in a special election early last year to replace the late Democratic Sen. Ted Kennedy, who held the seat for nearly five decades.
A WMUR poll of Massachusetts voters released last week suggested Warren has the best chance of any of the Democratic candidates to win back the Senate seat. According to the survey, Brown led Warren by nine points in a hypothetical 2012 general election matchup. Brown led the other candidates listed on the poll by wider margins. The survey indicated that Warren led her competitors in the battle for the Democratic nomination.
Warren was named a special adviser by President Barack Obama to oversee the development of the newly created Consumer Financial Protection Bureau. This year she was in contention but was not nominated as the director of the new bureau. She left Washington in early August and returned to Massachusetts, a move that stirred rumors she would launch a bid for the Senate.
While she sounded like an outsider in her video announcement, Republicans will try to portray her as an insider.
A Massachusetts Republican source tells CNN that "Warren, who continues to earn her reputation as a creation of DC and the insiders pick with little interest or attachment to the state, made another Martha Coakley-like error in failing to even once utter the word 'Massachusetts' in her announcement video."
The Washington DC-based Progressive Change Campaign Committee announced Wednesday it raised over $200,000 for Warren's campaign. The liberal organization said they would make the funds raised available to Warren when she launched a campaign.
Fundraising is crucial to Warren's effort. Brown's re-election campaign has approximately $10 million cash in hand to put toward his efforts and polls indicate he is popular with Massachusetts voters.
– CNN's Gabriella Schwarz contributed to this report.
– Follow Paul Steinhauser on Twitter: @PSteinhauserCNN.