I seem to have noticed a bias in betting odds for US presidential elections, which I feel is the result of international "ignorant voting influence."

However here, maybe the dynamics is different. To check this, I went to the Las Vegas betting odds, figuring that LV odds were more US-centric.

https://lasvegassportsbetting.com/2020-US-Presidential-Election-Las-Vegas-Odds_P14398.html

Here you can see a trend in which Biden did seem to have an advantage, but that has now vanished.