There could be a court challenge by the Liberals in this and other NDP held ridings in Quebec (pending formal complaints to Elections Canada) due to irregularities in the nomination papers:
I'm not sure I get why Corderre and the rest of the Liberal crew think that it is a good idea politically to try to overturn clear election results on what amounts to technicalities on a ballot petition. Do they really want to look that petty and indifferent to what the voters just said they wanted?
I understand that they are trying to create a narrative undermining the legitimacy of the NDP gains in Quebec, but it seems incredibly counter-productive to me. If they manage to force by-elections, the voters will be angry about it, the NDP could run stronger focused campaigns to retain the seats if they had to. How hard would it be to find a stronger NDP candidate in Bethierville or any other riding in Quebec to given the results of May 2?and the Liberals are out of the running in almost all of the seats.
And do they really want to initiate a game of challenging the nominating petitions of duly elected MPs? How certain are they that all of their members did everything exactly right? Will we start having all the parties combing over each other's petitions after the election seeking to disqualify even candidates who won a clear mandate? Do they think the voters will approve of that kind of "gotcha" politics?
If they overplay their hand here, it will create a pretty strong voter backlash against them.
As a side note, at the moment I'd urge the party to think about flooding Quebec - especially ridings like Berthier-Maskinonge - with speaking tours and media events highlighting a lot of the unheralded new members of the NDP caucus. (Of course after giving them some kind of bootcamp on how to deal with media, key issue talking points, etc). There are a lot of impressive people who got elected, and aggressively introducing them to Quebec voters now is an important part of counter-acting the narrative claiming they are all neophytes unprepared for prime-time.
I could see town halls and issue meetings where 3 or 4 new MPs appear together - matching a labour activist like Patry or Boulerice or Turmel with one of the students, add in some one with governmental experience (the new MP from Montcalm was a local mayor, Boivin and Mulcair have been in Parliament), with one of the folks with a history of issue activism (plenty of environmentalists, health care, etc expertise), an economist like Guy Caron, etc. Lots of diversity to highlight too - a good number of visible minorities, strong female representation, at least one openly gay member, etc.
Such a public roll-out seems to me essential not only to fighting the cheap shots, but also as part of a long term strategy cementing a long term relationship with Quebec voters. That way, these kinds of cheap tricks the Liberals and Conservatives are trying to pull will have less impact on public perceptions. And in the off chance they manage to use the courts to force a by-election somewhere, the public will be more likely to stick with the NDP because they see a party of substance and depth, not the caricature that the other parties and the media are trying to paint right now.