IHR...the mere fact that you need examples clearly shows how blinded you are and how you have ignored your responsibilities. If you, or others, have not figured it out by now, it is clear and unequivocal that you simply have not researched the matters very well. Becuase if you had, we would not be having this exchange. And since you have not, you simply never will get it.
Do your own leg work, IHR, but I will give you a little hint....look for older coverage from his Illinois Senate days...stuff they could not scrub. Look for the stuff he said about whties and hispanics competing for traditional balck seats in Iowa.That is a good start. But don;t stop there...look deepet and go back further even. There is stuff out there. Read his own book: Dreams of my father. Look how he decided he wanted to turn his back on his white heriatage and family members. Check out his communist roots in Hawaii and how that has influenced his socialistic styles.
As someone who has grown up around and knows the ugliness of black racism, and in an Irish Catholic family, I know it when I see it. Good luck with your work.