Which presidential campaign pioneered the use of small-dollar recurring donations through a dedicated online platform, revolutionizing political fundraising?

Political campaigns have been transformed by digital technology and innovative fundraising strategies. This trivia question explores a groundbreaking digital fundraising technique that changed how political campaigns raise money and engage with supporters. Test your knowledge about this significant shift in political campaign financing that has influenced how candidates from local to national levels fund their campaigns.

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Barack Obama's 2008 campaign with its custom platform that processed over $500 million in mostly small donations
Donald Trump's 2016 campaign with its WinRed platform focusing on recurring donations
Bernie Sanders' 2016 campaign with its 'Feel the Bern' donation ecosystem
Hillary Clinton's 2016 campaign with its 'Hillary Victory Fund' online donation hub