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With days to go until the midterm elections and with buckets of money being poured into this year's races, negative campaign ads are battling it out on airwaves and on TV screens across the country. But are these smear campaigns actually beneficial to the candidates who fund them? Do they leave a lasting impression in voters' minds or just a bad taste in their mouths? And if they do work in swaying voters, why? On this week's edition of The Breakdown, Stanford political science professor Shanto Iyengar joins The Nation's DC editor Chris Hayes to figure out whether negative ads ever have positive effects.