Money, as they say, talks. In Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right, Jane Mayer traces the network of political funding and lobbying spearheaded by the Koch brothers. Although they feature prominently in this book, this is not solely about them. Rather, it's about how a concerted effort in the past decades has influenced American politics. It's interesting because Mayer positions this story as a fundamental…