ribit,
here's the problem, Trump did/does know about the KKK!
He wanted 'any' votes, any....
He should scare the crap out of you & the rest!
....
But if he really needs to do research on Duke and his ilk – and I envision Trump hunched over a laptop, hunt-and-pecking for "Duke" and K-K-K in Google – he can start with the oped that he penned for the Times on February 19, 2000 (h/t Justin Green) explaining why he was not going to seek the Reform Party nomination. He wrote about how America might be "ready for a businessman president" and how exploring such a run was the "greatest civics lesson that a private citizen can have" before growing concerned about the Reform Party's "fringe element" including "Elvis look-alikes, resplendent in various campaign buttons and anxious to give me a pamphlet explaining the Swiss-Zionist conspiracy to control America."
He concluded:
I leave the Reform Party to David Duke, Pat Buchanan and Lenora Fulani. That is not company I wish to keep.
Duke was so well-known that Trump didn't feel the need to identify him in the oped, though he had several days earlier when issuing a statement withdrawing from the race: "The Reform Party now includes a Klansman, Mr. Duke, a neo-Nazi, Mr. Buchanan, and a communist, Ms. Fulani," he said then. "This is not company I wish to keep." Well 16 years is a long time (even if Trump does have "the world's greatest memory"). Maybe Trump, unique among Americans who aren't brain-dead, has forgotten who Duke is, what the Klan is.
more:
http://www.usnews.com/opinion/blogs/robert-schlesinger/articles/2016-02-28/donald-trump-denounced-david-duke-before-he-refused-to-denounce-david-duke

DO SOMETHING!