Mulcair is marking the first anniversary of his party's historic election breakthrough, which propelled it to official Opposition status.
He's telling his caucus that the Conservative government is on the defensive and the NDP can capitalize on that.
He says Canadians count on the NDP to stand up to Prime Minister Stephen Harper.
Mulcair dismissed the Liberals as a docile group that only pretended to be an opposition during the years of minority government.
He says the NDP will hold the Conservatives to account.
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