A third new poll has found Elizabeth Warren pulling ahead of Senator Scott Brown, giving the Democratic challenger momentum before their first debate on Thursday. A Suffolk University/WHDH-TV survey had Warren at 48 percent and Brown at 44 percent, the opposite of a similar poll in May that had Brown at 48 percent and Warren at 47 percent. Pollster David Paleologos attributed the shift to Warren’s national exposure through her speech at the Democratic National Convention.
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