To answer the original question, if it turned out that Trump was a racist I’d be surprised and disappointed, but so long as he wasn’t against OUR race it wouldn’t stop me from supporting him. Racism is not an aveira, and there is certainly no mitzvah to oppose all racism. It’s a bad midah, but we already know Trump has many bad midos, though none as bad as those of all his opponents.
If it had turned out that he or his campaign did after all conspire with Russians to leak the DNC emails, that wouldn’t bother me AT ALL. It’s not a crime, and the leak, no matter what motivated it, was a positive thing. It gave the voters valuable information that NOBODY DISPUTES WAS TRUE. But of course we now know that the whole thing was a hoax cooked up by the Democratic Party in order to undermine Trump, and everyone who supported it needs to held responsible.
Likewise, it would not bother me AT ALL had he actually explicitly told the Ukranians that the aid HE decided to give them (after 0bama had refused) would only be forthcoming if they investigated Burisma. This would be no different from Biden’s BRAGGING about having blackmailed the previous Ukranian govenrment into firing the prosecutor who was conducting the investigation.