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Why it took two weeks for a Donald Trump attack ad to anger people

Why it took two weeks for a Donald Trump attack ad to anger people

If you're running a political campaign and want an effective ad attacking your opponents, you need not only to be clever, you have to get the timing right.

That's a key, early finding from a team of researchers who have set out to answer a question on which hundreds of millions of dollars in campaign spending turn every four years: How do the ads that stream into our living rooms actually change the minds of voters?

By far one of the most effective ads the researchers studied so far was a spot titled "Quotes" that attacked Donald Trump for his insults of women. The ad, produced during the Republican primaries by

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