Trump's strategy: racial polarisation?

[Redban]

Racial polarization is not a good strategy for him. Of all the races, whites are the least monolithic politically.

65-70% of whites might go Republican on their best year, but the other 30-35% are people (e.g. environmentalists, LGBT activists, youths, scientists, professors, city-dwellers, atheists etc) who will just never vote Republican because voting Republican defies their core beliefs.