Something about the web - maybe the solitary nature of posting to it - seems to suggest the idea of private communication. It isn't. It's more public and out there in the world than any newspaper or television station, no matter that you may not have intended it that way. That's a lesson for myspace teenagers and facebook college students. Not to mention politicians.
Many commenters on political sites, this one included, regularly use pseudonyms. (This site, like many, prefers real names but allows pseudonyms.) Commenters probably think this means they're anonymous; but not always. The lesson being, don't post what you aren't comfortable standing behind.
Story in point is recounted on David Postman's blog. It stems from a discussion on Sound Politics, where blogger Stefan Sharkansky was writing about the rules concerning petition signature gathering for initiatives. (The details are another issue.) Comments to his post included at least three snarky takes from "PDC expert," saying "Stefan - your ignorance is stunning," "[Tim] Eyman is a liar and the sheep on this blog will believe any lie he tells them," and so forth.
Which might have been that, except that Sharkansky decided to track down the commenter. Using the comment's home IP address, and traced it to the city of Kent. An information request tracked it directly back to state Representative Geoffrey Simpson, D-Covington, who acknowledged the comments were his.