I've heard him criticize Republicans before. As for his "irrational hatred of Alan Keyes" (a mischaracterization and exaggeration, to be sure) and "third parties", as far as I'm concerned, his credibility is only enhanced by your description.
How does that logic obtain? The fact that someone criticizes an "icon" makes his iconic status that much more secure? Boy, I bet that really makes for some DEEP thoughtful self-analysis on Medved's part. He's never wrong in your book, apparently.
His own COLLEAGUE (a fellow hardcore Republican radio talk show host in Seattle) agreed with me in person about his irrational dislike for Keyes and hatred of third parties. I live and work in Seattle and have corresponded with Medved. How do YOU know him? Just because someone criticizes him, you rush to his defense? You sound as if you have the same knee-jerk reactions he does. It never ceases to amaze me on FR how when someone criticizes a favorite, there is a rush to suspect the critic's "credentials". Your whole point turns on the assumption that I'm part of the unwashed "not authentic" conservatives whose instincts are so wrong that you can count on the fact that whatever I espouse, must be bad, and whatever I hate confirms its goodness to you.
You don't know me.
If you want sustained, reasoned, careful thought, go with Thomas Sowell, George Will, Charles Krauthammer or Victor Davis Hanson. If you want minute detail accompanied with a lot of "because I said so" go with Medved.