(CNN) – The Massachusetts race for a U.S. Senate seat remains deadlocked between Sen. Scott Brown, the incumbent Republican, and Democrat Elizabeth Warren, a poll released Wednesday showed.
Brown had a one-point advantage over Warren, though the 48% and 47% they scored, respectively, is within the Suffolk University/7News poll’s sampling error of plus or minus four points.
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Recent polling in the state has showed a tight race, with Warren closing the gap since a February Suffolk poll, which showed her down by nine points, 49% to 40%.
The race has only become more heated since that and other early polls, with both candidates now on the air with television ads and a recent high-profile controversy over Warren's heritage.
Nearly seven out of ten likely voters, however, told the pollsters that the story is not "significant," while voters were split over whether Warren listing of herself as Native American in faculty directories, and possibly on other documents, impacted her career. Warren, who is a professor at Harvard University Law School but on leave this spring, said she highlighted her Cherokee roots to meet professionals of a similar background.
Brown has stressed his independence while Warren has pointed to her ties to President Barack Obama, who received a 62% favorability rating in the most recent Bay State survey. Warren helped set-up the Consumer Financial Protection Bureau in the Obama administration.
The state's presidential vote last went for a Republican in 1984 when every state but one voted for former President Ronald Reagan's re-election.
Forty-seven percent of likely voters said they saw Brown as an independent and only one-in-ten said the first word that came to mind to describe him was "Republican." Brown won a 2010 special election to fill the Senate seat left vacant when longtime Democratic Sen. Ted Kennedy passed away in 2009.
Twenty-three percent of Warren supporters said their vote would be one against Brown, and 53% said there is a benefit to having one Republican and one Democrat in the state's delegation to the U.S. Senate. The state's senior senator is John Kerry, a Democrat.
With months left to go in the race and the candidates stuffing their campaign coffers, 42% of respondents said Brown is running a better campaign, while only 23% pointed to Warren. Although both have spent just under $5 million thus far, Warren has raised approximately $15 million, to Brown’s approximately $11 million, according to the latest filings with the Federal Election Commission.
The survey included 600 telephone respondents interviewed between May 20 and 22.
– CNN's Gregory Wallace, Ashley Killough, and Paul Steinhauser contributed to this report.