I think it has more to do that many "Seminar Callers" are beyond emotional response and have a well organized throught process for their position. Oddly, you can be right or wrong and still have a well founded thought process and be able to defend it. That's why Rush, Hannity et al hate "Seminar Callers". They can't be easily debunked.
Aaaah.
As liberals are wont to do, you have missed the entire and real distinction. When Freepers do it, they (mostly) never hide the fact they are Freepers up front.
Seminar callers always begin their spiel with "I am a conservative, voted for Goldwater, Reagan, Bush and Bush, but..."
That's is the difference.