It's housing. Which isn't 100% fair since that issue is primarily provincial/municipal. But liberals have always known that the Canadian media (and thus voters) is too dumb for federalism and have never let that stop them from meddling in prov/muni issues before.
I'll never support PP. Between environmental issues, LGBTQ issues, and his general skeevyness, I could never. But I don't blame anybody who is getting renovicted and finding no place to live for noticing he's the only one talking sense on the subject.