But he quickly ran into a bit of hot water by suggesting the NDP's policy supporting public funding of Catholic schools should be reviewed.
Prue says he thinks "it is time" that the party takes a look at the issue.
As handlers tried to stop the news conference, Prue insisted he wasn't trying to re-open the debate about religion and schools that caused so much trouble for Conservative Leader John Tory in last year's election.
And he insisted it would be up to someone else to bring forward the idea of changing the policy on school funding at the NDP's leadership convention next March.
Any candidate who is willing to champion this issue will carve out a pretty decent chunk of support. Do any of them have the political will?