I can't bear to think that he could win but I'm prepared to face that reality if I have too.
I comfort myself with the fact that "demography is destiny" and the likes of Trump or other right wing GOP candidates achieving electoral success are diminishing rapidly in the near future, this is the last "hurrah" if you will for rural, white, lesser educated, right-wing christian (mostly males) as they are an ageing population in decline. I don't think they are enough to swing it for him this time either really (but daren't get complacent).
The GOP has spent the last few decades stirring up religious, sexist, racist intolerance in their supporters which has left them being the party that wants to kick out all immigrants, dislikes Mexicans and Muslims in particular, wants to control women's bodies and autonomy and insert Christianity further into government, schools and healthcare decisions. This is completely out of step with the changing demographics in the USA. Hispanic voters in particular are fast becoming a formidable voting block along with women. The GOP knows this of course but they can't seem to help themselves from pursuing anti-immigrant, sexist policies. They have to keep pandering to their ever-decreasing ageing right wing base.
To be honest, Trump wouldn't even be this close to winning if it weren't for the fact that he's running against Hillary Clinton. I think perhaps people outside of the States don't realise how intensely many Republican voters HATE her. My inlaws are decent people, religious and lifelong Republicans and unfortunately I know they will all vote for Trump because of the intensity of their hatred for Clinton - I can't fathom it but they strongly connect her to Bill Clinton whom they hate even more. They can't stand Trump but they'll vote for him because of this.