In an average of four nation-wide polls, Donald Trump is in 4th place among African-American voters: Clinton 86%, Stein 5%, Johnson 4%, and Trump 2%. Even Romney did better, and he was running against the first ever black, incumbent president.
Black voters are expected to make up 10% to 15% of the electorate, so he would have to over-perform with some other demographic to have any chance of winning. Hispanics? No, a huge deficit there. Women? Same thing. White men? Depends on whether they have a college degree. Frankly, there just aren't enough white men without college degrees to make up Trump's huge deficits among those other groups.