Chevron, Valero, and Devon Energy were among the largest donors to the super PACs aligned with Mike Johnson and Mitch McConnell last year.
Senate Leadership Fund
Three of the four super PACs aligned with House and Senate leaders brought in record high amounts from their "dark money" affiliates in the midterms.
Both chambers of Congress are planning to vote on the For the People Act, which would force dark money groups to reveal their donors.
Use these interactive maps to see how much money dark and gray money groups spent on congressional races in your state.
Besides being Tillis’ top campaign donor, Blackstone’s CEO has given $20 million to a super PAC attacking Democratic challenger Cal Cunningham.