I believe Trump and Joe Biden do have a contest here but we should not just ignored the other candidates , it is not only fair but also disrespectful for them since I do believe that
those candidates are way more suited for this job as compared to a orange racist and a corrupt leader.According to the google , there are around 1214 people who are standing for the elections.
https://www.bbc.co.uk/news/amp/election-us-2020-54334173The list is endless. But I wanted to ask one question here : Why did people never choose a woman ?
The US itself is a narrow minded nation but I think we can make a change. If you see the history of the US presidents it's laughable. People would prefer choosing Trump! Instead of a woman or a qualified man much more capable of handling the politics.
We should gamble on it and at the same time we need to spread the word and try and change the air around the Presidential elections.
Back to the question : I am aware that betfair is providing what you are looking for but I haven't tried it yet
There are very simple reasons for why what you are asking for has never happened and would never happen neither. The number one reason why democrats and republicans go against each other and no other candidate ever gets any attention is the simple fact that if you want to vote for a third party candidate and you do not want to see the other party get elected neither, you have a bigger chance staying with your party.
Let's say you hate trump, but you do not like Biden neither, even though you dislike Biden you have to vote for Biden to keep trump out of oval office, if you go vote for a third party instead of Biden, you end up helping trump more. That is a HORRIBLE system and I hope it changes, but that is how the system works.
Also people do not hate women, they just hated Hillary Clinton, even though I despise Trump to my core and would have voted Hillary if I was American, I still think the hatred towards her made sense too.