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As Digby noted, it looks like this is Case Closed -- the Koch Brothers can no longer claim that they're not behind the Tea Party movement or the astroturf group Americans for Prosperity. Here's more from Grist.

Koch brothers’ Tea Party connections confirmed [VIDEO]:

The billionaire Koch brothers have long claimed that they have no direct connection to the Tea Party, denying that their vast oil wealth is directly funding corporate front groups like Americans For Prosperity (AFP), the key organizers of the fake grassroots Tea Party movement.

David Koch told New York Magazine earlier this year, "I’ve never been to a tea-party event. No one representing the tea party has ever even approached me."

But the Guardian reports that footage has emerged showing David Koch at the podium during an AFP gala receiving direct and detailed reports from his astroturf AFP army on their efforts to organize tea parties around the nation.

Watch the clip from the new documentary (Astro)Turf Wars: How Corporate America Faked a Grassroots Revolution.