Which digital product innovation is credited with revolutionizing political fundraising by enabling small-dollar donations at unprecedented scale during the 2008 U.S. presidential election?

Political campaigns have evolved dramatically with technology and product innovation. From traditional door-knocking to sophisticated data analytics and digital strategies, the tools candidates use to reach voters have transformed. This trivia question explores a groundbreaking product innovation that fundamentally changed how political campaigns operate and connect with constituents in the modern era.

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ActBlue's recurring donation platform
Facebook's targeted advertising system
Mailchimp's email marketing automation
NationBuilder's community organizing software