Which celebrity's endorsement of Barack Obama in 2008 was credited with helping him secure approximately 1 million additional votes according to political analysts?

Throughout political history, campaigns have leveraged influential public figures as 'brand ambassadors' to boost their appeal and reach. These endorsements can significantly impact voter perceptions and campaign momentum. This trivia question tests your knowledge about one of the most pivotal celebrity endorsements in recent political history that helped transform a candidate's image and appeal to a crucial demographic.

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Oprah Winfrey
George Clooney
Bruce Springsteen
Leonardo DiCaprio