What are the meanings of "dead skunk" and "skinned possum" in this TV sketch?

Both represent something repulsive, something that most people would rather avoid if possible. No one wants to have to step over a stinking dead skunk, but if it’s right there in your path, you just hold your nose and step over. Even a live opossum is not very attractive, but a skinned one even less so.

Skinned possums look absolutely unworldly. Dead skunks (usually run over by a car or truck) stink to high heaven!

I laughed my butt off. How great would that be if you could actually have translators like that. Listening to politicians talk would be amazing. I would tune in for all debates.