Poll: Warren, Brown tied in Massachusetts Senate race

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Warren still technically has a Democratic primary get through, but has established herself as the stand-out fundraiser of the 2012 Senate cycle, raising $5.7 million in the last three months of 2011. Brown's fundraising has also been impressive; he pulled in $3.2 million during that period.

The two have forged a deal to keep outside groups from spending on ads in their race, a landmark agreement that has further intensified the national interest in their battle.

The poll of 503 likely voters was conducted Feb. 6-9 and had a margin of error of plus or minus 4.4 percentage points.