By Michael Dorf Despite my best efforts to block "comment spam" on this blog, the spammers have found ways around my defenses. Thus, if you go to nearly any post that is more than a week old you will find advertisements for gold, pharmaceuticals, and other worthless items--sometimes in Chinese, Arabic, or other foreign languages. Some of the comment spam uses an algorithm that randomly quotes parts of the post, so that it appears to the casual observer as an actual comment, except that upon inspection it proves to be nonsense with links to spammers' sites. The comment spam appears to be more or less randomly distributed, but there is also an intersting bunching phenomenon, whereby one kind of comment spam appears to attract more of the same kind of spam. My personal favorite is an October 2012 post on the Ex Post Facto Clause. As I compose this post (on Friday, Dec. 26) it has 154 comments, nearly all offering to cast spells, presumably for a fee. The spellcaster spa