Updated: 2:31 p.m.

Harvard Law School professor Elizabeth Warren, the presumptive Democratic Senate nominee in Massachusetts, raked in a whopping $5.7 million in the fourth quarter of 2011, a campaign source confirmed.  

Warren bested Republican Sen. Scott Brown, who pulled in $3.2 million in the last three months of the year.

Brown ended 2011 with about $12.8 million in cash on hand. Warren had more than $6 million in the bank. Warren’s fundraising figures were first reported by the Boston Globe.

“From all across our commonwealth, people are supporting our campaign and the fight to level the playing field for middle class families,” Warren said in a statement. “With Wall Street lining up against this campaign, already contributing millions and willing to pay any price to try to stop our work, it’s going to take a strong, grassroots effort like this to win.”

The campaign said that the average contribution was $64.

Brown will officially launch his re-election campaign on Jan. 19, the two-year anniversary of his come-from-behind victory over state Attorney General Martha Coakley (D).

Recent polling has shown the Senate race is extremely close. Roll Call rates the contest as a Tossup.