I don't see any reason for the candidates to raise the spectre of Republican racism, but if the Dems or the media raise it, that's precisely what you'll see. Like Reagan, Bush I, Bush II, and the RNC they'll reject the ideology and it's supporters. Happened before, will happen again.
First you say RP’s “racism and anti-semetism” are threats to the republic now you are saying no big deal. I honestly don’t get where you come from with these outbursts. You are like O’Reilly he brings Al Sharpton on his show, agrees with him that America is a racist nation, and then moves on. If its a big deal then you must want them front and center of the debate. Literally Paul and his neo-confederates number in the thousands, what do you have to lose by denouncing them? Don’t hide.