The Pollcast: Byelections, byelections, byelections!

The CBCPollcast, hosted by CBC poll analyst ric Grenier, explores the world of electoralpolitics,political polls and the trends they reveal.

There are a few thingsto watch in the four federal byelections scheduled for Dec. 11.

Will the Conservatives be able to hold on to their B.C. seat inSouth SurreyWhite Rock after the resignation of former Surrey mayor Dianne Watts?

What impact will the arrivalof NDP Leader Jagmeet Singh have in a diverse, suburban, Greater Toronto Area riding like ScarboroughAgincourt?

And who will the candidates be for the Conservatives in BattlefordsLloydminster in Saskatchewan and for the Liberals in the Newfoundland and Labrador riding of BonavistaBurinTrinity, where the incumbent parties are expected to easily hold their seats?

• Upcoming byelections provide glimpse of 2019 battlegrounds
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But these aren't the only ridings to keep an eye on.

One day after the four byelections were called, Liberal MP Denis Lemieux announced he would resign his Quebec seat of ChicoutimiLe Fjord, a riding he won by just 600 votes in 2015. The byelection will have to be called in the six months following Lemieux'sofficial resignation, which he saidwould be in the next few weeks.

Another battleground Quebec riding could be up for grabs soon to go along with ChicoutimiLe Fjord.

Former NDPleader Tom Mulcairhas indicated he may step down as the MP for Outremont by the end of the year. If he does, the riding he won in an upset 2007 byelectionwill be hotly contested by both the New Democrats and the Liberals, who held the riding previously.

To discuss the four upcoming byelections and the ones that are. or could be. just over the horizon, CBC polls analyst ric Grenier is joined by Jol-Denis Bellavance, Ottawa bureau chief for La Presse, and the CBC's Catherine Cullen on the latest episode of the Pollcast.

Listen to the full discussion above or subscribe to the CBCPollcast and listen to past episodes.

Follow ric Grenier, Catherine Cullen and Jol-Denis Bellavanceon Twitter.