I don't know this for a fact, but since we make such a big deal here about civility, I suspect a few of those lefty bloggers might be wondering about the Ann Coulter deal. Again, Stanley Kurtz at NRO says all we'd need to say about it:
What to make of all this? I’ve already argued that Peter Wood gets in right, in his new book A Bee in the Mouth: Anger in America Now. There’s plenty of anger out there on both the left and the right. Yet there’s also a difference between the two
sides. The right is embarrassed by the new vulgarity, as we see in the move by conservative bloggers to repudiate Coulter. The left, on the other hand, seems at home with New Anger, as we see in The Nation’s defense of the Edwards bloggers, and in Wolfe’s failure to recognize the troubling nature of his conservative-fascist comparison.
That, it seems to me, is the main point.