Notice they're targeting bloggers, and not politicians or big-shooters like Limbaugh. They want to intimidate, and they're picking what they believe to be the softest target; to either get these people to stop telling the truth and move on to something else, or to live in fear for continuing to do what they do.
This will be a test for the conservative blogosphere, and I suspect the Leftists are watching this very closely. If they can continue to do that and get away with it without consequences, then it will only get worse. The job for the good guys is to band together and not let it drop no matter what.
This would be a good cause for Bill O'Reilly. He's a blowhard, but on things like this, he does better than ANYONE else at getting an outrage against decency into the news, demanding justice, and keeping it in the news until justice is done. If he is not in the loop on this yet, someone needs to bring him into it.