Grassroots groups in some Ontario communities, including Peterborough and Kitchener-Waterloo, are talking about whether it might be possible for opposition parties to co-operate and run just one candidate per riding against Conservatives in the next federal election.

"The goal would be just that candidate and the Conservative candidate — two people to select on the ballot," said Peterborough business owner Joel Parks.

The CBC's Laurie Graham looks at how they are going about it, and what pushed them into action.