You've probably seen this already, but if not, Leiter Reports now has the real story on blogs, persuasion, and invective.
I cling to the hope that it may be right not to agree 100% with his view. There is always the chance that some person who isn't already a partisan might drop by and possibly be persuaded. Or maybe not, in blogs. More likely in newsgroups, and I'm well aware of what I'm saying when I say that.
Thomas Jefferson and C. S. Lewis both wrote of the uncertain nature of persuasion; and they were talking about the reactions of reasonable people. I think John Locke did also, though I doubt I could ever find the quote.
But hey, as long as persuasion is such a completely uncertain business, why not just blast away at the idiots and criminals and not worry about wounding the feelings of innocents who happen by? There are hard questions and easy questions, as Leiter says. So off I go to indulge my current favorite guilty pleasure, the Rude Pundit.
Update: Been hearing enough lately about how Baghdad is just like Houston? Oops, I wouldn't want someone to read a hidden attack on Houston into that; we pundits just mean Baghdad has this crime rate that's not so bad compared to this or that US city. Now, with a tip of the hat to Leiter again, read what the United States government says about vehicular travel in Iraq.