The CBC Pollcast, hosted by CBC poll analyst Éric Grenier, explores the world of electoral politics, political polls and the trends they reveal.

During the last campaign and in the months that followed, the Liberals pledged that the 2015 election would be the last fought under the first-past-the-post electoral system.

That promise no longer stands. So what happened?

After more than a year of speculation, debate, committee hearings, town halls and an online survey that was roundly panned by critics, the Liberals decided to abandon their promise to change the way Canadians vote.

What was behind the decision to renege on that campaign promise? Did electoral reform ever stand a chance of succeeding?

To break it down one last time, Pollcast host Éric Grenier is joined by the CBC's Aaron Wherry and the Ottawa Citizen's Kady O'Malley. 

Listen to the full discussion above — or subscribe to the CBC Pollcast and listen to past episodes.

Follow Éric Grenier, Aaron Wherry and Kady O'Malley on Twitter.