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Analysis

US election 2020: These 'surprise votes' aren't part of a conspiracy - we have just seen 'red mirage' then 'blue wave'

The US president has suggested something underhand is going on as the Biden vote increases quicker than his own.

Election officials count ballots in Wisconsin
Image: Election officials count ballots in Wisconsin
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From the early hours and through the day, Donald Trump's post-election tactic has been to raise questions over the validity of the ballots being counted and threaten counteraction.

"They are finding Biden votes all over the place - in Pennsylvania, Wisconsin, and Michigan. So bad for our Country!" he tweeted.

"How come every time they count Mail-In ballot dumps they are so devastating in their percentage and power of destruction?" read another post.

The inference is clear: why is the Biden vote increasing quicker than the Trump number? Is something underhand going on? This is a conspiracy.

It isn't.

The "blue wave" and "red mirage" are long-standing features of a US election.

The red mirage refers to the early successes seen for the Republican tally. That is because on-the-day voting is counted first, for security reasons: on the day voting tends to be more fluid.

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And then comes the "blue wave" - early postal votes counted later. As Democrats tend to favour this method of voting, so it plays out that the latter stages of a count sees their tally surging.

This has been particularly profound this year. The coronavirus pandemic saw a rise in mail, drive-thru and early voting to help protect the electorate against the virus.

How the US election is being won - in charts and maps
How the US election is being won - in charts and maps

The reason the pre-polling day turnout was so high (over 100 million votes cast) was in no small part down to that.

So Biden might be the beneficiary of a delayed but significant blue wave.

These aren't "surprise votes" as Trump suggests rather the plebiscite taking its natural course.

Just, perhaps, not to his liking.