In keeping with the animal images created by political cartoonist Thomas Nast 130 years ago (he invented the donkey and the elephant, among many other things), I would be simple.
The Rat!! It is so obvious. Lawyers, abortionists, felons, Clintons...It is the perfect new symbol of the 'rats!!!
Sitting on a park bench
Eyeing little girls with bad intent
Snot is running down their noses
Greasy fingers smearing shabby clothes
democrats