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How Obama Used Big Data to Rally Voters

By Sasha Issenberg

How President Obama’s campaign used big data to rally individual voters.

Two years after Barack Obama’s election as president, Democrats suffered their worst defeat in decades. The congressional majorities that had given Obama his legislative successes, reforming the health-insurance and financial markets, were swept away in the midterm elections; control of the House flipped and the Democrats’ lead in the Senate shrank to an ungovernably…

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