If no one is immune to bias, then no bias can penetrate a critical thought. The thing is, if these people are, as they claim, undecided; then they are without bias. It is easier to assume that these people were biased against Trump.
However, as a Presidential candidate, he has to appeal to more than just his base. He will never appeal to everyone, of course but he should appeal to more than 30% of voters if he wants to win by a "so-called" landslide. And that means making some sacrifices. If his 2016 is to be understood to be a learning curve, he has to prove he has learned from his mistakes and not repeat them in his second term. Can he prove that to enough people to gain the electoral vote? That is the question.
It is my predication he will win by the electoral college, barely, but lose the popular vote, again, by an even wider margin than last time.