I'm not sure how the election is regulated. Wouldn't it be possible to delay (or invalidate) the election because one of the candidates wasn't able to take part in the final part of campaign?
E.g. in some countries it is controlled how much time candidates get in public media - each one gets free time for public TV ads and a seat in all debates - even if he is a complete moron*. So if there were just 2 candidates and one of them wouldn't be able to reach the voters because of illness, I'm pretty sure some countries would postpone the election.
I'm not sure if that would make any sense in US though, since formally you're not choosing the president.
*) which leads to some really interesting candidates. Like the guy from the photo.
Everyone watching the presidential debate in Poland (2015) had to hear what he thinks about abortion, nuclear power plants and genetics.
And you may think he's just a beefy lawyer or maybe an action movie star who immigrated from Austria.
But he is actually a bouncer.
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