The latest perverse and destructive outburst from Vice President Biden is laughed off by some as, "Well, that's just Joe!" Saying to a mostly black audience that the Romney-Ryan team want to "put y'all back in chains" is the kind of slander that, if it were spoken by Paul Ryan, would lead to calls for his being removed from the ticket. It's another case of who is covering the news, rather than what they are covering.
Biden has been wrong about a long parade of issues during his career. For example, his solution for Iraq was to divide it into several sectarian segments.
During the Reagan years, when he was ranking member on the Senate Judiciary Committee, he opposed one conservative judicial appointment after another with the oleaginous smear: You have done nothing wrong; you're a fine person, but because charges have been made against you--correct or incorrect--you don't meet the "higher standard" that we must impose in this case. He did that repeatedly.
At the least he has terrible judgement. Yet this man a heartbeat away from the Presidency.
(Update: Rudy Giuliani shares a similar opinion.)