A poll conducted by Democratic firm Public Policy Polling gives her a six-point lead over brown, with 50 percent to Brown's 44 percent support, which is the largest lead she's posted yet in any PPP poll.

The PPP poll also indicates Brown may finally be feeling the hurt of the tough battle he's faced over the past few months. Brown's net approval rating dropped 14 points since mid-September, and voters increasingly believe he'll be more of a partisan voice for the national GOP -- a charge lobbed by Warren that may be sticking at this point.

And a poll from conservative-leaning firm Rasmussen gives her a two-point lead among likely voters, with 49 percent support to Brown's 47 percent support. That poll gives Brown a 30-point margin with independents, but Warren seems to be shoring up Democrats. The last Rasmussen poll, conducted last month, put them in a dead-heat.

Though the race remains close, Warren has led in all but one poll released this month, and the PPP poll seems to indicate her lead is slowly growing. The strong numbers for Warren come the day after the candidates debated for the third time. One debate remains, and if poll numbers continue to trend in Warren's favor, it could be a pivotal one for Brown.

The PPP poll was conducted among 1,051 likely voters from Oct. 1-11, with a margin of error of plus or minus three percent. The Rasmussen survey was conducted among 500 likely voters on Oct. 10, the day of the debate, and has a plus or minus 4.5 percent margin of error.