Hillary Clinton, like Bernie Sanders before her, attacked the Koch brothers at the Democratic presidential forum in South Carolina Friday night.

Riffing on how the campaign finance system allows the wealthiest Americans to stack the deck politically, she went after Charles and David Koch, libertarian billionaires who donate large sums of money to Republicans and conservative causes.

"The Koch brothers are some of the biggest deck stackers you can find," she said.

During his own talk, Sanders challenged Clinton to "walk the walk" on campaign finance reform, noting that he doesn't have a super PAC and relies on small donors.

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