Actually, I can't. That is what I thought was deficient in the article too. This pointy head flails and flogs and makes no headway along the lines of cogent thought. Rather typical malady amongst liberals.
In other words, the Leftists are flailing about trying to find a reason for the success of talk radio and other outlets. The best they can come up with is that the corporate marketing guys are pulling a fast one.
Encouraging, isn't it? :)