Joe Biden's "chains" gaffe rippled all the way to the Sunday talk show dial, Politico reports, with Rudy Giuliani backing off his earlier charge that the veep is "not that bright," but very much questioning whether he's got what it takes. "I don't think he's nuts," conceded Giuliani, but "I wonder if he's got the kind of balance" to be president. "This guy is like one gaffe after another, and he's a joke on late-night television. I think they've also locked him in his room for the rest of the campaign." Not so fast, countered Obama deputy campaign manager Stephanie Cutter, citing GOP talking points about "unshackling" the financial industry. Biden "was just taking that metaphor a step further," she said. "And the word he used, chains, is a distraction from a larger argument."