Key findings from our investigation into Koch network spending 4likesCommentE-mail Key findings: Six nonprofits tied to billionaire Koch brothers have aired more than 43,900 ads in key Senate races. Six Koch-connected nonprofits are responsible for nearly one in 10 political ads in Senate races this cycle. Koch-backed Americans for Prosperity has aired more than 27,000 ads in nine battleground Senate states. GOP’s Senate hopes energized by Koch network ad blitz