The Washington Post and the Center for Responsive Politics have just published an expose revealing how a labyrinth of 17 tax-exempt groups and limited-liability companies tied to the billionaire Koch Brothers raised at least $407 million during the 2012 campaign.

The staggering amount is equivalent to the combined spending of all unions in state, federal and local races — it dwarfs nearly all other sources of political spending in 2012.

The groups were designed to help conceal the sources of the money, much of which went to voter mobilization and television ads attacking President Obama and congressional Democrats.

For more, we are joined by Lisa Graves, executive director of the Center for Media and Democracy, and publisher of and ALEC

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