'Dark money,' used by both parties, featured in $100 million pro-Biden ad blitz

While numerous groups have used this method to mask their source of funding over the years, Brendan Fischer, the federal reforms director at government ethics group Campaign Legal Center said the sheer level of dark money that is fueling this massive last-minute operation is unprecedented. "I can't recall such a huge infusion of dark money from an affiliated [nonprofit] in the final stretch of an election," Fischer said.

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