A lot of these are funny or neat plays on trumps 2016 creed but don't really work as slogans.
A smart slogan would depend on the candidate. E.g. A New Hope would be silly if Biden were the candidate.
The best political slogan ever (IMO) was the UK conservatives "Labor isn't working". It has to be not just a dig on the opponent but also a theme for a candidates campaign. If I were placed in charge right now I'd probably consider something like "United". This can be used with "United we stand" "United together" "United States" themes that you could branch off of.
