As Republican Richard Tisei prepared to announce Democrats who are behind his campaign for Congress, a new poll shows his opponent, US Representative John Tierney, leading Tisei by seven points. The WBUR poll, conducted by the MassINC Polling Group, showed 22 percent of likely voters are undecided, but 39 percent of the 401 likely voters surveyed were with Tierney compared to 32 percent for Tisei.
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