Uh I'm getting nothing but broken links from your sources, and for the record I've seen O'Reilly go after the far right, but they aren't respected at all (at least Republicans don't want anything to do with them).
However, the far-left is part of the backbone of the Democrat party and the Presidential Candidates for the Dems, associated with them directly.
If McCain had associated himself with nutcases calling for the death of Barack's wife, the press would have had a field day. However, Obama associated with Huffington Post and the press was completely silent.
Furthermore I really don't care where the comments were nor do I care who posted those comments on Huffington Post, the staff there knew about them and refused to remove those comments until Bill O'Reilly blasted them for it.