Normally you might be swayed by people putting their money where their mouth is. This race is swayed by Trump voters who literally put their money in his losing DJT stock, over and over, knowing it's going down the toilet, to show Trump their devotion.
I'm not sure how that would influence odds making. It could mean it's even worse for Trump -- if people will bet unfavorable odds for Trump, that's all they'll be offered. But even they want the odds to show Trump as underdog.
@AlphaCentauri That's an interesting take, but my bet is on the fact that bookies don't play those kind of odds.