Which celebrity's 2008 endorsement of Barack Obama was estimated to have generated approximately 1 million additional votes according to a Northwestern University study?

Celebrity endorsements have long played a significant role in political campaigns, often influencing voter perceptions and fundraising capabilities. From Hollywood stars to sports icons, these endorsements can significantly impact a candidate's visibility and appeal to specific demographic groups. This poll tests your knowledge about one of the most influential political endorsements in recent U.S. history and its measurable impact on campaign dynamics.

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Oprah Winfrey
George Clooney
Bruce Springsteen
Ellen DeGeneres