From the article:
What is it about Rush that drives the left crazy (that is, crazier than they already are)? The answer is actually quite simple: Rush is the most important voice in the conservative movement. Others want to be, some claim to be, but he is. More than any conservative politician, columnist or pundit, Rush speaks for us. His opinions are principled and consistent. He has a brilliant mind and a voracious appetite for knowledge and truth, all of which he uses behind his golden EIB microphone to teach and persuade as he cuts through the daily media clutter. He has the guts to say what so many of us are thinking to ourselves. And Rush's likable and optimistic personality and entertaining style attract increasing numbers of conservative adherents. Liberals consider Rush and his talk show the greatest threats to their agenda and pursuit of power, and they're right.