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Could they challenge it through the courts, citing the "unprececedented" pandemic that they (possibly wantonly?) fucked up the handling of and delay/obfuscate that way?
I don't think so. Congress could try to change the date to 2021+, but if they succeeded (which I doubt) it would be immediately challenged in court and be struck down.
States also handle elections, not the federal government, which complicates things in terms of trying to interfere in a nefarious way. I guess some Republican states could attempt to delay their own elections/refuse to send voters to the electoral college. No idea what would happen then... Presumably they've forfeit their votes which would be bad for the republicans.
But I'm playing this out from memory of teaching America politics in 2012.
Could they challenge it through the courts, citing the "unprececedented" pandemic that they (possibly wantonly?) fucked up the handling of and delay/obfuscate that way?