I am and have been betting on trump on betfair. Not big money.

They are educated on the election process - I took them to the gambling ombudsman some years ago when they paid out on an Obama election after the media proclaimed him winner and they paid out instantly on the market. They were advised to be more careful with their terms and at the time seemed to equate the popular vote to the election itself.

Nowadays they have a separate betting market for popular vote and next president, amongst others.