Together, Charles and David Koch control one of the world's largest fortunes, which they are using to buy up our political system. But what they don't want you to know is how they made all that money. The enormity of the Koch fortune is no mystery. Brothers Charles and David are each worth more than $40 billion. The electoral influence of the Koch brothers is similarly well-chronicled. The Kochs are our homegrown oligarchs; they've cornered the market on Republican politics and are nakedly attempting to buy Congress and the White House. Their political network helped finance the Tea Party and...