of americans for prosperity's founders, billionaire industrial brothers charles and david koch. so who are the koch brothers? explain it to me. >> they are owners of the second largest private company in america. probably everybody has some product from koch industries in their life. >> like what? >> they make everything from stain master carpet to dixie cups to georgia pacific lumber. but they are huge proprietors of oil. >> are they representing the interests of a wide group of the american public or are their interests, can they boil down to how much money it makes them? >> the kochs would say that what they are pushing is something that they think is good for all americans. but if you take a look at it, what you find is it's especially good for the kochs. >> the kochs declined our request for an interview. but the reporting shows how americans for prosperity used money from like minded donors to