Actually, I think his full name is Markos Moulitsas Zuniga, or something like that. The New York Times did an article about him and other lefty bloggers a little over two years ago.
Personally, I think the man is BAD news. Do you remember that incident in Falluga where some American contractor or soldiers were killed, and their bodies were hung from a bridge. All Markos had to say about that inicident was "screw 'em" referring to the Americans.