Trump's strategy: racial polarisation?

[Lincoln Republican]

Won’t work, because at least 40% of whites won’t vote for him. Adding this up to 95% of blacks, 70-75% of latinos and 80% of Asians, Hillary will win decisively.

This is correct.  Democrats will win at least 40% of the white vote, and since the Republican candidate this time is Trump, I expect Democrats will win a higher share of the white vote this election.