A defeated MP says he isn't sure if Mulcair should stay on as leader.
The party also announced several other changes it intends to make.
NDP insiders say the caucus responded positively to the decision due to Dewar's positive rapport in and outside the party.
She referenced Canada's niqab ban debate.
NDP quietly changed job ad to equalize pay between French and English-speaking campaign workers.
Thomas Mulcair could very well finish third in Ontario and still become the next prime minister of Canada, writes Bryan Breguet.
Justin Trudeau's party has "hit a new low" in polls: Nanos
For B.C. New Democrats Leader Adrian Dix, 2013 started as a year full of promise. The NDP was well ahead of the Liberals
UPDATE:Thomas Mulcair was elected leader of the NDP on Saturday at the party's convention in Toronto. LIVE BREAKING RESULTS