Ron Paul - uberRino
Now, as propaganda goes, this is a second-rate effort. For one thing it involves the use of a language non-native to your target audience, and therefore will only really be received by people with a certain modicum of education. This is counter to your purpose. Also, the term "RINO" is an acronym known primarily to Republican party members and those who debate them, again limiting the scope of your audience.
On the plus side, it's short, punchy, and would fit on a bumper sticker. Goebbels would give you a C+.