http://www.prwatch.org/news/2016/04/13086/kochs-americans-prosperity-club-growth-wi-shell-save-ron-johnson
"With an empty seat at the U.S. Supreme Court and public pressure mounting to overturn the Court's Citizens United decision, which open the door to unlimited spending by nominally "independent" Super PACs and dark money nonprofits, the stakes could not be higher for the Kochs and their cronies who have worked for decades to undermine disclosure rules and limits on political spending."