Which digital marketing innovation first allowed a U.S. presidential campaign to raise over $500 million from small online donations?

Digital marketing has revolutionized political campaigns in the 21st century. From Barack Obama's groundbreaking social media strategy in 2008 to the sophisticated micro-targeting techniques used today, political campaigns have become increasingly data-driven and digitally focused. Test your knowledge about the digital marketing innovations that have transformed modern political campaigning and how government entities communicate with citizens in the digital age.

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Barack Obama's 2008 campaign's social media strategy and email segmentation system
Donald Trump's 2016 Facebook advertising micro-targeting approach
Hillary Clinton's 2016 data analytics platform 'Ada'
Howard Dean's 2004 Meetup.com grassroots organizing platform