"...support for Obama, especially because it is clear that African Americans almost exclusively cast their votes based on race. That could really end up biting the Dems in the ass if Obama gets the nom..."

                      I think that's what Bill was doing in South Carolina. Now that Obama has been cast as the "black" candidate, the rift between the blacks and the Hispanics has driven the latter into Hillary's camp. It might be nasty politics, but it seems to be working.