Charles Koch, whose wealth Forbes magazine calculates at about $21.5 billion, argues in his letter that “prosperity is under attack by the current administration and many of our elected officials.” He repeatedly warns about the “internal assault” and “unrelenting attacks” on freedom and prosperity. A brochure with the invitation underscores that to the Koch network, “freedom” means freedom from taxes and government regulation. Mr. Koch warns of policies that “threaten to erode our economic freedom and transfer vast sums of money to the state.”
Never mind that most of the people their "grassroots" billions target don't have much prosperity, comparatively, to begin with. They're out of work, or on Medicare, distracted easily by specters of immigrants, Muslims and gays, deeply frustrated by and yet in profound denial about their own very real lack of economic power, and so make easy targets for seductive rich agendas veiled in language about universal "freedom."
For much, much more on Charles and David Koch's unhealthy influence, see here.