The MapLight analysis considered contributions given in the 2018 election cycle for House members and contributions given in 2014, 2016, and 2018 election cycles for Senators. Contributions are from ExxonMobil, ConocoPhillips, Chevron, Kinder Morgan, Phillips 66, EOG Resources, Marathon Petroleum, Energy Transfer LP, Valero Energy, Occidental and Anadarko. These are the 10 largest U.S. energy companies, according to Yahoo sectors as of Sept. 24, 2019