Yes, racism. I'm sure you're aware of the voter suppression history of the Republican party in the South. 

Voter suppression, targeted at blacks, Latinos and the poor, has been a weakness of the Republican party  since Strom Thurmond switched from Dem. to Rep. in 1964 and the rest of the segregationists followed. That is well documented and the unfortunate reality that the R. party has to work on. 

Using words like "jungle", "ape", "monkey"....that's a wolf whistle to the white elitists and we weren't born yesterday. Time to knock that crap off.

And as far as Obama...when did he accuse racial bias when it wasn't warranted by a preponderance of statistics and evidence? 

I mean, do you believe that racism exists? That it is a problem? What about climate change? The moon landings?

I'm not aware of "shenanigans" that have been pulled in open primaries. Can you cite some? 

I know that Putin had 1000's of fake news stories alleging this sort of thing. Putin likes closed primaries too.