The now famous "Dean Scream" at a supporters' rally at the 2004 Iowa caucus is thought to have cost Vermont governor Howard Dean the Democratic US presidential nomination that year.

He went on to become chairman of the Democratic National Committee leading the party to sweeping electoral victories in 2004 and 2008 - the last time the Democrats held both Houses of Congress and the White House.

He now works to promote democracies around the world and thinks that democracy in his own country is under threat. 

RTÉ's Caitríona Perry talks to him about the state of US politics and the Democratic Party.

He began by expressing his praise for his party colleague Nancy Pelosi who broke the record this week for the longest speech from the floor of the House of Representatives - over eight hours.

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