In an unprecedented attack on two private citizens, the Barack Obama campaign has issued an email from Jim Messina, the campaign manager, specifically targeting the Koch brothers.

Here’s the text:

In just about 24 hours, Mitt Romney is headed to a hotel ballroom to give a speech sponsored by Americans for Prosperity, a front group founded and funded by the Koch brothers.

Those are the same Koch brothers whose business model is to make millions by jacking up prices at the pump, and who have bankrolled Tea Party extremism and committed $200 million to try to destroy President

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