Angered by criticism of his military strategy in Kosovo, President Clinton flung clods of his own excrement at White House reporters Monday. 'I am the alpha male!' Clinton shouted to Sam Donaldson of ABC News. 'None shall usurp my dominance of the social hierarchy!' The outburst was the first of its kind since Clinton's March 19 urination on Chinese Premier Zhu Rongji at a Beijing arms summit. 