vaguely related but if you go and check 20-30 newspaper websites and visit a political article, you'll see that in at least 18 of them the comments are turned off... but in those last 2, even if its not a paper typically associated with any particular side -- the comments are always overwhelmingly right leaning or beyond.
You see this on twitter and facebook too. Soon as a poll is open to everyone, the results side wit us. It's only when its heavily moderated or restricted that things look otherwise... Kinda like politicstoo and this category when you think about it..
One only allows leftist view points = heavily leftist
This one (at least mostly and for a little longer...) allows all = mostly conservative