Super PACs and other independent groups are barred from directly coordinating with candidates. In this election cycle, they have spent upwards of $140 million on House and Senate races. “Super PACs are, at this point in the election, the majority advertiser,” said Jonathan Symonds, executive vice president of Ace Metrix, a Silicon Valley-based firm that analyzes advertising. “Increasingly, because of the velocity of new [ads] and the number of different entities that are in these races, it is hard to know what is effectively and ineffectively conveying an issue.”
Source: Super PACs’ spending isn’t always welcomed by candidates they support - The Washington Post
