Which presidential campaign was the first to effectively leverage big data analytics for voter microtargeting, setting a new standard for digital campaign strategy?

The intersection of technology and politics has transformed how campaigns are run. From the early days of radio addresses to today's data-driven microtargeting, political campaigns have evolved dramatically in how they reach and persuade voters. This trivia question focuses on a pivotal moment in campaign technology history that changed how political products (candidates) are marketed to the electorate.

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Barack Obama's 2008 campaign
George W. Bush's 2004 campaign
Hillary Clinton's 2016 campaign
Donald Trump's 2016 campaign