If there were ever any doubt that the Massachusetts Senate race is close (and there wasn’t), let it be vanquished.

A new poll of likely Massachusetts voters from Suffolk University and 7News found the race to be a statistical dead heat. In a horse-race matchup, Republican Sen. Scott Brown got 48 percent while presumptive Democratic nominee Elizabeth Warren got 47 percent. Five percent were undecided.

While 72 percent of voters knew about the controversy surrounding Warren and her claim that she is of Native American heritage, it did not appear to have a demonstrable effect on the race. Earlier polls, taken before the controversy, found the race to be neck and neck.

Given that he is in the midst of a heated campaign, Brown remains extremely well-liked. Fifty-eight percent of those polled had a favorable opinion of him while only 28 percent had an unfavorable view of him. Thirteen percent had heard of him but were undecided.

Forty-three percent of those surveyed had a favorable opinion of Warren while just 33 percent had a unfavorable view of her. Eighteen percent had heard of her but were undecided.

The statewide poll of 600 likely Massachusetts voters was conducted May 20-22. Live telephone interviewers surveyed respondents on landlines and cellphones. The margin of error was 4 points.