"The war of words between the Obama reelection campaign and billionaire conservative activists Charles and David Koch escalated Wednesday. The president's campaign manager, Jim Messina, sent a letter to Philip Ellender, Koch’s president for government and public affairs, disputing Ellender's claim that an organization partially backed by the brothers represented the interests of thousands of grassroots donors."

"'You argue that Americans for Prosperity is a grassroots organization of everyday citizens. But its emphasis on rolling back environmental protections and blocking a clean energy economy appears to be nothing more than an effort to promote the corporate interests of your employers and others who lavishly, and secretly, fund its operations,' Messina wrote."

Justin Sink reports for The Hill's E2 Wire blog February 29, 2012.
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