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The Oprah Effect: One Million Votes, Study Says

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How much did Oprah Winfrey's endorsement help Barack Obama? Quite a lot, a new study concludes. Economists at the University of Maryland find that Oprah's endorsement brought Obama 1,015,559 votes. The researchers linked subscriptions to Oprah's magazine and participation in her book club to increased voter participation.

The study concludes:

The results of this study suggest that Oprah Winfrey's endorsement of Barack Obama during the 2008 Democratic Presidential Primary had statistically and politically significant effects on Obama's political outcomes. Winfrey's involvement increased the share of the vote and the campaign contributions received by Obama, as well as the overall level of voter participation.

The whole study can be read here.