Billionaire conservative activists Charles and David Koch said President Obama’s reelection campaign is trying to intimidate people by demanding to see a donor list for their group, Americans for Prosperity (AFP

Phillip Ellender, president of public affairs for the Koch Companies, sent an open letter to the Obama campaign last week after campaign manager Jim Messina accused the Kochs of bankrolling “Tea Party extremism” and profiting from “jacking up prices at the pump.”

Ellender disputed both counts, and said AFP is funded by “tens of thousands of members and contributors from across the country.”