Dark money spending, from groups that conceal their donors, favors GOP candidates six to one. Just three groups, One Nation, with ties to Republican Majority Leader Mitch McConnell; the Koch network’s Americans for Prosperity; and the U.S. Chamber of Commerce, account for 67% of all dark money spending. "While this problem was created in part by 2010’s Citizens United decision, the 2016 data shows we have truly crossed a new Rubicon," wrote Vandewalker.
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