“The Koch network has said it plans to spend between $300 million and $400 million on policy and political campaigns in 2017 and 2018 — up from the roughly $250 million invested in the 2016 campaign season”

Koch-Backed Group Pushes Three Democrats to Support GOP Tax Plan

A group backed by billionaires Charles and David Koch said Thursday it will spend $4.5 million on ads to urge three Senate Democrats who face challenging 2018 re-election bids to back Republican efforts to dramatically reshape the federal tax system.