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Environmental group goes up with big ad buy against Scott Brown

The high-profile Massachusetts Senate race is already getting a significant TV ad buy. The environmental group, the League of Conservation Voters, is going up with a $1.8 million broadcast and cable ad buy in the Boston media market, according to a source with the group.

The ad accuses incumbent Republican Sen. Scott Brown of having "gone Washington" and that he "hasn’t voted a single time for the environment since he’s been in Washington, which is something we’re pretty sure his constituents are going to be surprised to hear," the source said.