Which political campaign was first to effectively use 'micro-donations' as a major fundraising strategy, raising over $500 million through small online contributions?

In recent decades, political campaigns have undergone dramatic transformations in how they reach and persuade voters. From traditional handshaking and baby-kissing to sophisticated digital marketing strategies, campaign teams now utilize cutting-edge retail marketing techniques to 'sell' their candidates. This trivia question focuses on a pivotal innovation that revolutionized political fundraising and voter engagement in the digital age.

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Barack Obama's 2008 presidential campaign
Donald Trump's 2016 presidential campaign
Hillary Clinton's 2016 presidential campaign
Bernie Sanders' 2016 primary campaign