Here is a very careful analysis of electoral prospects. I will make it a lot simpler. Donald Trump is mobilizing the ignored core of the conservative population who has felt left out for generations now. That provides a numbers advantage that must be met by an equal turn out of the so called progressive vote. It is not going to happen with Hilary.
This early momentum is not going to go away either and it is overwhelming for the Democrats. Worse, the Republican race is essentially over save a skirmish or two. We now have a full assault landing on Hilary while she is wrapping up her own lack luster campaign. She will be the issue for much of the next few months and it will be messy. She can not simply brush it all off.
Better yet, Trump is tied to no policy at all unless you believe his shameless shoot from the hip style represents policy. Rather it presents easily dumped sound bites tossed at the spur of the moment and easily reversed by a simple i did not mean that. His real policy contributions are also been well received but leave nothing for Hilary to chew on without drawing attention to her multiple failures.
Would Donald Trump defeat Hillary Clinton? Who would win if they face each other in the general election?
I did not vote for him in my state's caucus, and I can't imagine myself voting for him under any circumstances. I will never vote for Hillary Clinton for anything -- ever -- but my distaste for Mr. Trump is well established. But, it would be foolish to (as seems to be common on the answers here) allow my distaste for him pervert my view of the politics of this potential race.
You will notice that I have given Mrs. Clinton the benefit of the doubt in states like Nevada, Colorado, Iowa and New Mexico, that have an huge Hispanic population, and would (in this hypothetical example) come out for her as they did for Obama.
The number of these voters who have been depressed, ignored, dismissed, and outright ridiculed is tremendous. And there are a lot of them in states like Pennsylvania, Ohio, Michigan, and Wisconsin.