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I don't really understand the late counting of postal votes that we've been hearing about - does that mean that those last 6% are all postal votes left to be counted till the end (and possibly / possibly not more likely to favour Biden)?
Yes. In some states they pre-count the postal ballots (eg Ohio), so Biden led early there, but Trump overtook him from the later counts of in-person voting. In others (eg Pennsylvania), it works the other way round - they count in-person first (Trump lead) and then start on the postal votes which are likely to favour Biden. As the majority of postal votes are from people affiliated to a party, they have a good idea of the weighting towards each candidate.
This is Trump's isn't it?
Biden is behind in most of the states still to declare from this graphic linked below - for example he's behind 3% in wisconsin with 94% of their vote counted.
I don't really understand the late counting of postal votes that we've been hearing about - does that mean that those last 6% are all postal votes left to be counted till the end (and possibly / possibly not more likely to favour Biden)?
https://www.theguardian.com/us-news/ng-interactive/2020/nov/03/us-election-2020-live-results-donald-trump-joe-biden-who-won-presidential-republican-democrat