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A second poll in as many days shows Democrat Elizabeth Warren with a slight lead over Sen. Scott Brown, R-Mass., propelled by President Obama's 2-to-1 advantage in the Bay State. Warren leads Brown, 49 percent to 45 percent, in the poll, conducted by the MassINC Polling Group for Boston's NPR affiliate, WBUR-FM. Warren's edge is within the poll's margin of error of plus-or-minus 4.4 percentage points.

The previous WBUR-FM poll, conducted two weeks prior, also showed Warren with a slim advantage, 47 percent to 42 percent. That poll showed Obama leading former Massachusetts Gov. Mitt Romney, 59 percent to 31 percent. In the new poll, Obama leads by the same margin, 60 percent to 32 percent.

Warren maintains her lead despite a small likability gap. Fifty-two percent of likely voters have a favorable opinion of Brown, compared to 33 percent who view him unfavorably. Warren's numbers are more mixed: 47 percent favorable, versus 37 percent unfavorable.

But Warren continues to outpace Brown on two key measures. By a 43-percent-to-35-percent margin, voters say Warren "will stand up for people when in the Senate," and Warren leads by 6 points when voters are asked which candidate agrees with them "on key issues."

The poll was conducted Sept. 26-28, surveying 504 likely voters. On Sunday, the Boston Globe published results of a poll it commissioned that showed Warren leading Brown by a 5-point margin, 43 percent to 38 percent. The two candidates will debate Monday night in Lowell, Mass.; the debate will air in Boston on WHDH-TV, on regional cable network New England Cable News and across the country on C-SPAN.