The following is from Knitting Ramblings:
Here is something that may provide some insight into Obama supporters’ use of the race card. In 2007, it was learned that the University of Delaware has a mandatory program that requires residence hall students to acknowledge that “all whites are racist.” The program went on to offer misguided whites “treatment” for incorrect attitudes regarding class, gender, religion, culture or sexuality they might hold upon entering a school.
Now, why did the school think all whites are racist? Because this is their definition of racism: “A racist is one who is both privileged and socialized on the basis of race by a white supremacist (racist) system. The term applies to all white people (i.e., people of European descent) living in the United States, regardless of class, gender, religion, culture, or sexuality. By this definition, people of color cannot be racists, because as peoples within the U.S. System, they do not have the power to back up their prejudices, hostilities, or acts of discrimination.” The school’s policy deserves mention because it is advocated by most self-appointed black leadership.
There you have it. Blacks can’t be racist, because they don’t have power over anyone. Only whites can be racists. So for Obama and his people to call McCain or anyone racist is simply a way of saying “Hey, Whitey!”
Maybe this explains Obama's choice of Biden for VP on his ticket.
Source Source Source