Democratic presidential candidate Sen. Bernie Sanders (I-VT) has Charles and David Koch dead in his crosshairs, reported the Huffington Post. They have become the senator’s posterchild for political and corporate corruption.

Sanders spoke to a crowd of 3,000 on Saturday in South Carolina and noted how the Kochs have tainted American democracy by attempting to purchase candidates and elections. Sanders also called for campaign finance reform that would create public-funded elections that would phase out billionaire contributions.

“We live in a nation in which a handful of very, very wealthy people have extraordinary power over our economy and our political life and the media,” said Sanders to an enthusiastic crowd.

“They are very, very powerful and many of them are extremely greedy,” he continued. “For the life of me, I will never understand how a family like the Koch brothers, worth $85 billion, apparently think that’s not enough money.”

Sanders has raised millions of dollars for his campaign, but not a single dime came from billionaires or corporate lobbying groups. More than 400,000 individual people have contributed to Sanders’ campaign at an average of $31.20 per contribution.

Unlike the campaigns of GOP millionaires, and some Democrats, Sanders’ campaign “is a people’s campaign.”