Does worst mean:
- least able to achieve their stated agenda, ie worst at their job. (Trump)
- worst vision for America, ie most evil (Reagan)
- worst overall impact to America, ie one you'd kill with a time machine (Bush Jr, but Trump might catch up in term 2)
- Worst for the world, ie the one I'd kill with a time machine (Washington)
Although I'm not American and don't know your history that well.