Seriously if a casino offers that kind of odds today on a Trump win then I guarantee you something is wrong with their odds provider, the odds of him winning should not be that high and today it would make more sense if it was around @1.7 or something.
But to my understanding these were bets on the 2016 presidential election which was a different playing field, Trump was sort of a dark horse in the election and nobody really expected him to win at all.
If you looked at the *why* Trump was elected last time it was a vote against H.Clinton in so far as people just did not want another career politician. It had nothing to do with gender. Just the "air" of "I am a politician where-as my opponent isn't struck a raw nerve. The odds reflected that attitude instead of looking at the two candidates side-by-side.
I'm waiting for the "wag the dog" moment of this campaign - so far I haven't seen one.