Direct, succinct and simple. Outstanding.
I think it's best to avoid being "too clever by half" with concocted slogans and made-up words - the apolitical types that we're trying to win over cannot be expected to "get" those messages. Keep it simple and it'll resonate with more people.
Remember “Impeach the Cox-Sacker”? That one was clever and it worked. It has to be short as well as clever. (Trying to think of one . . .)