Great point by Arianna Huffington regarding conservative commentators. Why do they do so well on talk radio, but so poorly on the web?

Because they are blowhards.

Any attempt to interrupt or correct an inaccuracy gets easily roared down on talk radio, where the ability to deny interruption puts the speaker at an advantage. This advantage is worthless on the web, where people can and do comment, correcting and confirming the veracity of a given statement. Jump to 15 mins for the comments specifically on this. Or better yet, just watch the lot.