The super PAC aligned with Senate Majority Leader Mitch McConnell, R-Ky., has been revealed as the patron behind Mountain Families PAC, the nondescript super PAC launched to take down Don Blankenship in the Republican Senate primary in West Virginia.

In a Federal Election Commission filing, Mountain Families PAC reported Senate Leadership Fund as contributing the $1.4 million it used to fund attack ads targeting Blankenship during the primary campaign. The provocative energy executive who served prison time for his role in a mining disaster ultimately lost, finishing third behind winner Patrick Morrisey, the state attorney general, and Rep. Evan Jenkins.