Super PACs, many tied to major parties, spend more than $16.5M backing third-party candidates in pivotal races
Many pop-up super PACs formed this month won't have to disclose donors until after Election Day
More than 40 third-party candidates in pivotal House and Senate races are receiving support from outside super PACs, many with ties to the two major parties. The groups' spending totals more than $16.5 million, far more than virtually any of the candidates have raised or spent on their own, according to an Axios analysis of Federal Election Commission data.