Why not more talk about Reagan's carcass?

That's what it is, after all. Look at the dictionary.com definition:

The dead body of an animal, especially one slaughtered for food.

The body of a human.

Remains from which the substance or character is gone: the carcass of a once glorious empire.

A framework or basic structure: the carcass of a burned-out building.

This is poetry, baby. Look and learn.