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."
If you strongly believe that betting odds are "biased" then you should capitalize on them by betting against the bias.
Actually the reverse is true -- Biden has been the underdog up until this week. Its the first week his odds switched from a + to a -. This means betting on him pays less than 2:1, whereas it pays exactly 2:1 to bet on Trump.
For whatever reason, a bet on Biden in February would have yielded 20:1 odds -- now they are less than 2:1; that's quite a shift!
I think Trump was 500:1 at one point during the last election cycle.