Inside the Echo Chamber?

Have you ever wondered why it seems the mainstream US media (ABC, MSNBC, CNN, NYT etc.) all seem to have the same slant, er bias, er narrative? Has it ever occurred to you that they seem to be working off the same playbook? Yeah, I thought so too. Well here is a possible reason for that. I don't know if there's a Canadian version of JournoList, but I would not be surprised at all, at all.