Entering the final month of campaigning, support among likely voters continues to be there for Massachusetts Senate candidate Elizabeth Warren (D). Favorability is more up in the air.

A Sunday poll released by Western New England University (WNEU) / MassLive.com shows that Warren is maintaining a five-point lead over incumbent Sen. Scott Brown (R), 50 percent to 45 percent. Yet her unfavorability rating jumped from 33 percent to 41 percent over the past three weeks.

During that span, Warren and Brown partook in two heated debates. The Sept. 20 opener saw the duo spar over tax policy, with the Democratic challenger charging that Brown has impeded progress on jobs bills.

"When I talk about how people who are really struggling, I don't know how Senator Brown can vote against them. but Senator Brown is lining up with the Republicans to vote no," said Warren.

"The criticism you're hearing is that I don't want to raise taxes -- guilty as charged," Brown shot back. "I don't want to raise taxes."

That fervor persisted into last Monday's matchup in Lowell, Mass., where both candidates experienced their share of fumbles. When asked which Republican senators she would best be equipped to work with, Warren mentioned Sen. Richard Lugar (R-Ind.). The only problem was, Lugar lost his primary to Tea Party favorite Richard Mourdock. Brown's hiccup came on the question of his model Supreme Court justice, where he strung together a wide range of choices, from Antonin Scalia to Sonia Sotomayor.

The WNEU/MassLive.com poll was conducted by phone from Sept. 28-Oct. 4, compiling opinions from 440 likely voters, with a 4.7 percent margin of error. HuffPost's Massachusetts Senate race pollster trend chart, which merges together a lineup of dozens of polls, shows Warren holding a slim lead over Brown.

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