Which political campaign first successfully implemented a micro-donation subscription model that allowed supporters to make small recurring monthly donations?

The digital age has transformed how political campaigns and government entities engage with citizens. Subscription models have become an innovative approach for political organizations to maintain consistent funding and supporter engagement. This trivia question tests your knowledge of which political entity pioneered a significant innovation in subscription-based fundraising that changed the landscape of political donations.

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Barack Obama's 2008 presidential campaign
Bernie Sanders' 2016 presidential campaign
Howard Dean's 2004 presidential campaign
Ron Paul's 2012 presidential campaign