Want some proof that Trump knows he's losing? He's starting to try and drum up support from blacks, having apparently recently learned that they're allowed to vote. Some polls say he's getting about 2% of the black vote so if he can double his following with that group, it still won't do him a lot of good. I doubt he'll even manage that, especially if he keeps making his appeals to black voters from afar, behind podiums at gatherings that are whiter than a Pat Boone Fan Club meeting.
If he wants black people to vote for him he might try actually going and talking to some…but he won't. Trump's best argument that he's winning is the size of his rallies so he never goes anywhere they might not be huuugggge. (It helps to remember that Ross Perot got massive turnouts…and zero electoral votes.) His advocates point out that his rallies are open to people of all color — but as a mainly-Liberal guy, I sure wouldn't feel comfortable at one, even though I'm white and could pass for Republican.
The guy couldn't be doing a much worse job if he stood side-by-side with David Duke and promised free watermelons for all. And knowing him, he might. Philip Bump has more.