This combination of 2013 and 2012 file photos shows brothers David, left, and Charles Koch. In July 2018, an estimated 500 Koch donors — each having committed at least $100,000 annually — gathered in the mountains of Colorado for an invitation-only seminar that featured a handful of elected officials and high-profile influencers. The conservative network remains one of the nations most influential political forces. (Phelan M. Ebenhack, Bo Rader/The Wichita Eagle via AP)
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