I would venture to say that 99% of Americans don't have a clue who Michael Savage is. But evidently he has carved out some kind of niche right wing hate audience on the radio. And because MediaMatters has been documenting his hate speech evidently he decided to threaten them, kinda standard fare for right wing extremists these days. Well evidently MediaMatters isn't intimidated at all.
MediaMatters does great work and I am very happy to see that they won't allow anyone to use fear tactics on them.