Have you not noticed that there are graphics appearing pertaining to the caller's comments?
I've never called in so I don't know how they screen the calls. I know they split the lines and I'm sure they look for 30-day violators and drunks, etc. But, anything close to being scripted, I just don't buy it. I think I heard a host say that the screeners try to determine if the question is on topic and appropriate.
I honestly can't tell which way Brian leans, politically.