Polls: Elizabeth Warren Leads Scott Brown in Massachusetts Senate Race Despite criticism of her campaign by some of her Democratic allies, Elizabeth Warren may be gaining ground in her bid to unseat Senator Scott P. Brown of Massachusetts, two new polls suggest. A poll by Suffolk University and Channel 7 News in Boston released on Monday night found Ms. Warren leading 48 percent to 44 percent among likely voters, a spread that is within the poll's margin of sampling error of plus or minus four percentage points. That follows a poll released on Sunday by Western New England University that showed Ms. Warren leading 50 percent to 44 percent, which also falls within that poll's margin of sampling error of plus or minus 5 percentage points. Analysts said that Ms. Warren received a bounce from her prominent speaking role at the Democratic National Convention this month and that Democratic voters who may have been flirting with Mr. Brown were returning to the party's fold. As a Republican in a deeply Democratic state, Mr. Brown is swimming upstream. But Mitt Romney, his party's presidential candidate, is doing significantly worse. The Suffolk poll found that President Obama is trouncing Mr. Romney, a former governor of the state, 64 percent to 31 percent.