As Senator Scott Brown and Elizabeth Warren prepare for their second debate tonight, a new poll shows Warren leading Brown by two percentage points — 46 percent to 44 percent, with 9 percent undecided in the hotly contested race. The WBUR/Mass Inc. poll of 504 likely voters taken Sept. 26- Sept. 28 is the seventh of nine surveys taken in September to show Warren, a Democrat and Harvard Law School professor, with a small lead over Brown, a Republican. But the results are well within the poll’s margin of sampling error of plus or minus 4.4 percent.
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