Alan Keyes clearly has more intellectual and philosophical grounding than they can hope to compete with, or the average drooling slob who thinks they know politics...and then votes for Ross Perot. And he successfully dominate their brazen efforts to shout them down. This is probably the greatest reason the Left fears him...he beats them at their own favorite tactic.
Alan Keyes only real faults (as such)are (1) that he never sufficiently practiced Ronald Reagan's 11th Commandment (thou shall criticize no other Republicans); and (2) that he is not, as was Ronald Reagan, focussed on the optimistic vision of hope for a better future, but dwells overmuch on the grim condition of the present state of moral, ethical, Constitutional, legal and national security neglect.
That being said, I sure do look forward to seeing him again.
The 11th commandment is NOT in order in a talk show with any pretense of objectivity. The pessimism could be a downer if not handled with care, but the opposite would make for a rather dull show, unless Keyes wanted to be a counterpoint for the pessimists. Ultimately, Keyes will rise and fall based on the depth of his intellectual capital, and skill in creating an interesting dialogue. We shall see.