This is the first thing I found; take-out is, the flak they get over the whole political ads controversy isn't worth how much they make on them, comparatively. I'm inclined to believe them.
At a certain point in 2008, Obama was certain to be the Dem primary winner against Hillary. But CNN was still framing it as a tight contest. I wondered how much of that editorial decision was based on making sure eyeballs stay glued to CNN, so they can tell their advertisers "A 30 second slot costs this much at the moment...".