Which political campaign was the first to use 'Square' mobile payment technology to accept small-dollar donations directly through smartphones at campaign events?

The intersection of politics and technology has transformed how candidates engage with voters. From traditional mail campaigns to sophisticated AI-driven messaging, political retail strategies have evolved dramatically over the decades. This trivia question examines a significant technological milestone that changed modern political campaigning and voter engagement. Test your knowledge of how digital innovations have reshaped the political landscape!

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Barack Obama's 2012 reelection campaign
Donald Trump's 2016 presidential campaign
Bernie Sanders' 2016 primary campaign
Hillary Clinton's 2016 presidential campaign