Cynrychiolydd yr Unol Daleithiau, Mayor of Chicago, Democratic Caucus Chairman of the United States House of Representatives, Senior Advisor to the President of the United States, Pennaeth Staff y Tŷ Gwyn, Democratic Caucus Chairman of the United States House of Representatives, Senior Advisor to the President of the United States, Cynrychiolydd yr Unol Daleithiau, Cynrychiolydd yr Unol Daleithiau, Cynrychiolydd yr Unol Daleithiau