i'm going to presume that a third under-represented group would be disabled canadians, but i don't actually have rigorous data regarding the number of disabled mps in the house of commons.
there are two visually impaired members of congress, one liberal and one conservative. they both have prominent positions in their respective parties. that's 0.6% of the members of parliament.
while over 20% of the population self-identifies as having a disability, the definitions here are not consistent, and i know that they're not comparable.
but, these are the three groups that political parties in canada should be seeking to increase representation for: women, queers and the disabled.
they are also the three most oppressed groups in our society, by a substantive margin.