Which digital marketing innovation first allowed political campaigns to accept small-dollar donations online and is credited with revolutionizing grassroots political fundraising?

The landscape of political campaigns has been transformed by digital marketing strategies. What was once dominated by TV ads and door-to-door canvassing has evolved into sophisticated digital operations leveraging data analytics, social media targeting, and innovative fundraising techniques. Test your knowledge about a groundbreaking digital marketing innovation that changed how political campaigns operate in the modern era.

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ActBlue's recurring donation platform (2004)
Facebook's political ad targeting system (2008)
Twitter's promoted tweet program for politicians (2010)
Google's Campaign Manager for political races (2012)