Well... to be fair, Trump has done everything possible to prove himself both racist and demeaning (the latter refers to making fun of a handicapped person) with no political experience; were he an actual Conservative, he might have stronger numbers, but someone I know was making reference the other day to the exceedingly low numbers he has with the Hispanic population, which has heralded disaster in the past two Presidential elections. He is NOT a good candidate whatsoever, and his only real positive is that he is not Hillary.
The reality is that one of the two of them will be the next person whose workplace is at the Resolute Desk. Given that, as awful as he is, I am not alone in saying that I will be doing my part to ensure he is the next President of the United States, for the sole reason that if he is not, she will be.
Viewed in that light, I can see how Sanders' position is not contradictory.