they don't tend to want to give to afp very often.hey think, frankly, that we are too out there on the free market front. >> hockenberry: the koch brothers? >> david koch is the chairman of our afp foundation. we are glad to have his support. we don't disclose the level of contributions. but we are very proud to have their support. >> americans for prosperity. we're blessed with just such a leader in our chairman, david koch. >> hockenberry: with money from their oil and gas holdings, david koch and his brother charles, along with other powerful family foundations, have quietly become the venture capitalists of this free market ideology. >> ...american dream of free enterprise, capitalism is alive and well. >> the major funders of the climate countermovement are ideologically driven foundations that are very much concerned about conservative values and world views. >> hockenberry: sociologist and stanford fellow robert brulle is studying the funding patterns of these groups. in fact, he's noticed a new benefactor, an entity called don