Herman served as co-chair of Democratic presidential nominee John Kerry's transition team during the 2004 presidential election. In 2005, Howard Dean, serving as Democratic National Committee Chairman, appointed Herman and lawyer James Roosevelt, Jr. co-chairs of its Rules and Bylaws Committee. The position put Herman and Roosevelt at the center of a dispute between the campaigns of democratic primary candidates Barack Obama and Hillary Clinton over whether to seat delegates from Michigan and Florida at the 2008 Democratic National Convention. Herman endorsed Hillary Clinton in the 2016 Democratic Party Presidential primaries and served as Deputy Parliamentarian at the 2016 Democratic National Convention.