maybe they will postpone elections, do not know about the procedure, but that seems as rational idea, and probably there is some clause that "due to higher cause" elections could be postponed by month/two, and until then everything will probably be back to normal
Fact that Trump got Covid-19 isn't a reason to postpone election. After all, this virus isn't death sentence, especially if it's asymptomatic case. Elections should be held on time because it's not likely that everything will back to normal in upcoming month or two.
It's fake photo, there was no such episode in the Simpsons.