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
This is exactly what came into my mind when discovering that gamblers can bet on US presidential, but only choose between Baiden and Trump. What if another candidate win? It's far to be real happening but it's still a possibilty not considered by the terms of betting.
Americans didn't ever elected an independant candidate, and by checking three of them (according to the article you provide), they have great profiles with real programs for developement. Two of them are cryptocurrency billionaires.
Terms of betting can be more realistic if it includes all the candidates and not only those backed by parties .