You got it, from John Harwood:
He is not somebody who is infused with political correctness, the verbal equivalent of putting his pinky up when he opens his mouth. So this is what, the way ordinary voters are as well. They're not always worried about sort of calibrating every single word by "ooh, is this racially insensitive?" That's something that Joe Biden brings as an asset to the ticket. The gaffes actually show one of his strengths.
When asked for his opinion on this ... "idea," former Virginia Senator George Allen said, "That's the biggest bunch of horsesh** I've ever heard."