Thomas Mulcair is the new leader of the New Democratic Party of Canada (NDP).

Mulcair was elected, after a gruelling 12 hours of voting, at the NDP’s convention on the weekend.

The NDP is the political party that is Canada’s “official opposition” to the country’s governing party, the Conservatives.

As leader of the federal NDP, Mulcair will also become the leader of the Official Opposition.

The NDP had to elect a new leader after their last leader, Jack Layton, passed away from cancer in August 2011.