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Warren, Brown’s no third-party ad pledge holds

Viewers from Florida to Montana have been deluged for months by grainy images of politicians on Wild West wanted posters, cash changing hands in dark rooms, grandmothers losing benefits, and music that might be used to herald an impending shark attack.

Yet even as spending from super PACs and other interest groups reaches new levels this year, with more than $90 million spent in 16 states with Senate races, the money has not touched the Massachusetts Senate race since January.

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