Some are old-fashioned and simply go with this format:
[Name] for PresidentMany, however, have chosen an alliterative slogan which functions as an exhortative speech act:
Rely on RuthAnd one candidate had instead chosen a (near) rhyme and an alliterative nickname:
Stand with Stuart
Make it Millie
Only Sam can / Super SamShe has a superman outfit to campaign in as well.
I don't know if these things go in fads, or what. The most effective signs by far (in my opinion) didn't have any of these gimmicks, but had the same logo (a green pharmacy-style cross) and the candidate's name and one of her sensible policies, a different one on each poster, clearly written. The others don't put their policies on their signs, apparently assuming the alliteration will be enough.