I think candidates for office should be required to know this stuff. The guy doesn’t even have an eighth grade level understanding of civics, let alone US history. A hospital wouldn’t hire a doctor or nurse demonstrating a lack of knowledge in their field; a mechanic shop wouldn’t hire someone with no knowledge of how car engines work. There needs to be a vetting process to disqualify people from running who can’t show a basic understanding of the government in which they seek to work.
The thing is that public officials are appointed by the public, at least in theory, the public should care about these things and vote accordingly, they are the interview panel.
The very least that you can expect in a limited democracy with lower levels of public interest and participation is that candidates are representative.
When ones like this one are appointed it makes you wonder about what and who they are representing. I also think that in a basic sense activists, supporters or any kind of cause or political ideas are representatives too. If their personal lives look like shit and they are promise a better world you have to think twice about it.