From Pro publics.org
Here are the largest PACs where the money is comprised mostly from one donor. As you hear the rhetoric about political influences, keep in mind it applies to both parties. As you can see here, more Republican than Democratic PACs appear. On the other hand, the top two Democratic contributors were more generous than all the others combined. 😜 
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But where are the much demonized Koch brothers? If you pay attention to the adds from the Clinton attack machine you would think they are taking over the country with massive monetary donations.
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Supposedly the Koch brothers spent over $400 million in total on the 2012 election.
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