"You're not in this room today trying to figure out how to rig the game so you can be free to make money poisoning little kids, and neither am I," Brock told donors this month at a conference in Santa Fe, New Mexico, according to someone who attended the conference, but who declined to be identified because it was closed to the press.

"Subscribing to a false moral equivalence is giving the Kochs exactly what they want: keeping us quiet about what they're doing to destroy the very fabric of our nation," added Brock, whose deep-pocketed nonprofit groups are leading the charge to make the conservative megadonors Charles and David Koch an issue in the 2014 midterms.