Republican senator Scott Brown of Massachusetts has regained the lead in his race against Democratic challenger Elizabeth Warren, according to a new poll by the University of Massachusetts Lowell and the Boston Herald. Fifty percent of the 524 registered voters polled support Brown, while 44 percent support Warren. Among those polled who are likely voters, the margin is narrower: 49 percent prefer Brown and 45 percent support Warren.

Recent polls have shown Warren, the Harvard law professor and first-time candidate, with a small-to-moderate lead over Brown, and as the RealClearPolitics average shows, she may maintain that lead despite this poll. Furthermore, the 3-point margin between the candidates with likely voters in the UMass Lowell/Herald poll is within the margin of error. But if these new numbers predict a trend, that's good news for the Brown campaign; a string of polls this month have Warren leading, on average, by 4 points, and Brown hasn't led in a poll since August.

On Thursday night, Brown and Warren will face off on WBZ-TV, the Boston CBS affiliate, for the first of four televised debates.

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