18 percent:

Dick Cheney’s favorability rating. Ana Marie Cox responds: “If he had feelings, I’m sure they’d be hurt by this.”

UPDATE: Tom DeFrank writes in the NY Daily News, “Cheney may be an overall net political minus, but he’s a huge asset where it counts most for Bush: the Republican base, which adores Cheney. Bush’s approval numbers are at 30%, roughly the same size as his base. If Cheney left, this weakened President couldn’t absorb the backlash. They’re all he has left.”