Transparency in campaign spending is overwhelmingly popular with both Democrats and Republicans, because average folk know that dirty deeds go on behind closed doors. But the billionaires are battling back. The Koch brothers have a virtual cottage industry funding groups to advocate for “donor privacy,” and they are campaigning hard against any state or federal law that dares to suggest dark money groups should be required to report their funders. Milwaukee’s Bradley Foundation funds propagandists like the Wall Street Journal’s opinion writer, Kim Strassel, to pen books that argue that it’s the little guy that will be hurt by dark money transparency, not the billionaires in the Koch Network who regularly pledge to spend $400 million to sway campaigns and elections. Her book “Intimidation Game” never speaks of the dirty deals that can go on behind closed doors when voters have no idea who is ladling on the cash to aid politicians. Instead, she argues, that in pushing for good campaign and ethics laws, the left is bullying and harassing the right and attempting to “silence free speech.” But a refreshing wind blew through Congr...