Those wealthy enough to own homes are more likely to have the time (especially if retired!) to be able to organize, communicate with their representatives and assuredly to vote in an election.

In contrast the poorest working class people (renters) that are struggling just to survive, are more likely to be so busy working multiple jobs, commuting etc, that they literally do not have the time to vote in an election.

Additionally because of this, the two parties that have traditionally formed government, rarely even acknowledge the issues of the working poor, which means that the working poor are even more dissuaded from participating in the process, because regardless of who wins they can be assured that neither party is interested in policy change that would help them.