Nearly 15 years ago, the NDP became Canada’s official opposition. Now, Jagmeet Singh and the NDP are trailing far behind the frontrunners of the upcoming federal election and are no longer campaigning to win — but instead to hold the winners accountable, raising questions about the party’s future.

Gary Mason is a national affairs columnist at the Globe. He’s on the show to explain how Singh’s campaign is responding to waning support, what’s led the NDP to this point and what the party’s collapse could mean for Canada’s political landscape.

Questions? Comments? Ideas? Email us at thedecibel@globeandmail.com