Which presidential campaign was the first to extensively use microtargeting analytics to personalize voter outreach?

Modern political campaigns have evolved into sophisticated marketing operations, employing cutting-edge strategies to build candidate brands and engage voters. Campaign teams analyze vast amounts of data to create targeted messaging, much like corporations developing product marketing. This trivia question explores a notable innovation in political marketing strategy that changed how candidates connect with constituents.

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Barack Obama's 2008 campaign
George W. Bush's 2004 campaign
Bill Clinton's 1996 campaign
Donald Trump's 2016 campaign