Trump is a unique candidate who probably generates low propensity voters to vote for him. Do not sure what’s going to happen in 28.
There is certainly an argument to be made that he attracted higher %s of minority voters than other candidates would. However, he likely alienated some Republicans and certainly more moderates or independents, particularly in the suburbs. If Haley would have run, for example, while she may not have picked up as many Latino or AA votes, she would have performed better with white women.
So the question is - do the Dems really roll the dice that Trump is a total anomaly and that their stances and positions are what people want to vote for?