julianna goldman. thank you very much. >>> now the rare television interview with charles koch as in the koch brothers owners of the second largest private company. forbes estimates their worth $43 billion each. they have bankrolled a network of conservative groups that help start the tea party movement. in a book "good profit," koch writes bout the values that drive him personally and politically. he sat down with anthony mason for "cbs sunday morning." do you think it's good for the political system that so much what's called dark money is flowing into the process now? >> well, first of all my, what i what i give to politically, that's all reported, it is either to pacs or to the candidates. what i give to my foundations is, is all public information. but a lot of our donors don't want to take the kind of abuse that i do. they don't want these attacks. they don't want the death threats. so, they aren't going to participate if they have to have their names associated with it. >> do you think it is hea