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JAGMEET SINGH: Deputy leader of the Ontario New Democratic Party and a lawyer by trade, he lost in a federal bid in 2011, but his ambitions may still lie in Ottawa. He was being counted on to deliver his Brampton, Ont., riding for the federal NDP last fall, and their loss to the Liberals there raises questions about the wattage of his alleged star power, but he would give the party an infusion of youth and charisma.

ALEXANDRE BOULERICE: A post-Mulcair NDP may struggle to maintain support in Quebec, so Boulerice, 44, could appeal. Mulcair’s Quebec lieutenant, the Montreal MP also has strong ties to organized labour.

HASSAN YUSSUF: Or, if a return to the NDP’s labour roots is really what’s desired, why not go all the way? Yussuf, the president of the Canadian Labour Congress and an experienced figure in the international labour movement, called last week for Mulcair’s defeat despite endorsements from five member unions.

BRIAN TOPP: Rachel Notley is probably a no-go, but how about her chief of staff? A former Jack Layton confidant, Topp came second behind Mulcair in the 2012 leadership race, though he had the endorsements of senior caucus members and party luminaries like Ed Broadbent. He ran Notley’s war room during her successful campaign last year in Alberta, and has been her right hand since. A creature of the back rooms, he’s not a natural politician but does have significant power within the party.

AVI LEWIS: While father Stephen spoke on behalf of the party’s social conscience Saturday, it was son Avi, the husband of No Logo author Naomi Klein, who was working the convention floor all weekend to mobilize delegates behind the Leap Manifesto. A documentary filmmaker, Lewis has never sought or held office — but if the party takes a hard turn to the activist left, that may not deter its members.

National Post

EDITOR’S NOTE: This story has been updated to reflect that Lewis was not advocating for a leadership review at the convention.