Markos Kos Moulitsas in the U.S. Army. Markos Moulitsas Zúniga (/ˈmɑːrkoʊs muːˈliːtsəs/; born September 11, 1971), often known by his username and former military nickname Kos (/ˈkoʊz/ KOHZ), is the founder and publisher of Daily Kos, a blog focusing on liberal and Democratic Party politics in the United States.