Saulgoldie- I would like to point out that ALL talk shows that are even remotely engaging are very carefully screened.
As for your assertion that they weed out those with whom they disagree... it's false. They both often put callers with whom they disagree at the front of the queue. For good or for bad, they seem to enjoy the challenge of convincing someone to whom they are ideologically philosophically opposed. I've heard it MANY times with me own ears.
And Don- are you reading my mind? I would hold up Bill Buckley as, bar none, the greatest Conservative intellect of our times. He's one of my favorite. George Will comes in a close second. Bill's more entertaining in his manner of speech, though.