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Scott Brown leads Elizabeth Warren in poll

A second poll is showing Republican US Senator Scott Brown leading Democrat Elizabeth Warren by 9 to 10 points, a sign of potential concern for Warren after months of polling showed a closer race.

The poll of 456 voters, conducted by Opinion Dynamics of Cambridge, shows Brown leading Warren 52 percent to 42 percent in a theoretical match-up. Another 1 percent of voters said they were leaning toward Warren.

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