Here's my guess: They're going to skewer the left and then at the end, say how bad each candidate is and none of them is worth anything. It'll be the typical nihilist wimp-out from Trey and Matt. But it'll hopefully be funny up until then.
Hopefully it will include Cartman saying another, "Democrats really piss me off".
808 Douche and Turd
When PETA demonstrates against the use of a cow as South Park Elementarys mascot, the student body is forced to choose a new one. As the election approaches, Kyle tries to convince everyone that his candidate, a giant douche, is better than Cartmans nominee, a turd sandwich.