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For Democrats, Charles Koch and his brother David have become the not-so-hidden hand of corporate America, ever pushing the country further to the right.

In the last campaign in 2014, 80 per cent of the dark money was on the right. If it had been the other way around, I'd probably be writing a book about the dark money on the left. - Jane Mayer, author of Dark Money

As voters show up in droves to back their preference for president in the U.S. primaries, it is the flood of money flowing into those candidates' campaigns that is increasingly important in deciding who gets to the White House.

Activists hold a protest near the Manhattan apartment of billionaire and Republican financier David Koch on June 5, 2014 in New York City. Dark Money author Jane Mayer says she was target of reprisals for investigation of Koch brothers. (Spencer Platt/Getty Images)

New Yorker journalist Jane Mayer has spent years looking into the political activities of the Koch Brothers and other billionaires, and writes about her findings in her new book Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right.



This segment was produced by The Current's Howard Goldenthal.





