Washington/Lincoln easily.
Such revered people are revered because they were ahead of their time, not because their beliefs would be popular/good today. I don't think a slaveowner would actually have that easy a time winning all 50 states in 2018 America, regardless of what else he did. This is true of a lot of very popular historical figures; I think both Roosevelts would be torn apart for internment/blatant racism, and Kennedy for his philandering.
I would say the best bet as far as presidents go would be Eisenhower/Carter. There is probably a better ticket in historical senators or governors who were too ahead of their time to be nominated, but I am not knowledgeable enough to suggest one.
