Scott Brown launches first ad of Senate reelection bid

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The ad was announced the same day Brown and his top Democratic rival, Elizabeth WarrenElizabeth WarrenWasserman Schultz: 'Sometimes you just have to take one for the team' Chelsea Clinton's big moment Kaine as Clinton's VP pick sells out progressive wing of party MORE, signed a groundbreaking agreement to discourage outside groups and super-PACs from spending millions of dollars on ads in the race.

Warren launched her first ad in November, pushing back on negative ads aired against her by conservative group Crossroads GPS.

Listen to the ad:

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