Campaigns Find Ad Space Finite, Even on the Web

It turns out that the Internet does not have infinite capacity. At least not for political ads.

As an increasing number of campaigns and outside groups are finding out, premium space on the web has long been booked. Digital advertising is maturing much in the way television did, as targeting becomes more sophisticated and the definition of a viewer expands drastically. The more savvy players in the coming midterm elections made pre-emptive strikes to ensure ad placement when it matters most.