Tom Mulcair's political legacy will be as a strong orator, a champion for the environment and a chief architect of the orange wave that brought the party to historic heights in Quebec.
But he will also be remembered as the man who presided over a failed campaign that dragged the NDP from its first Official Opposition status back to a disappointing third-place finish.
Mulcair faces the end of his leadership after 52 per cent of delegates at the party's convention voted in favour of a leadership contest. His supporters had hoped at least 70 per cent would vote against a review.
Mulcair's biggest accomplishment was also his biggest failing: he managed to steer the party from the ideological left to the mainstream, said Andrea Perrella, a political science professor at Wilfrid Laurier University.