By Amanda Terkel and Ryan Grim
WASHINGTON -- At a private three-day retreat in California last weekend, conservative billionaires Charles and David Koch and about 250 to 300 other individuals pledged approximately $100 million to defeat President Obama in the 2012 elections.
A source who was in the room when the pledges were made told The Huffington Post that, specifically, Charles Koch pledged $40 million and David pledged $20 million.
More: Koch Brothers, Allies Pledge $100 Million At Private Meeting To Beat Obama