More so than the interview did.
You could tell Cheney meant it when he said that ultimately he was responsible for what happened. Now that he's had a few days to think about it, and know that Whittington has suffered, and what could have been, it really has set in on him. As he said, he'll never forget the sight of Harry falling to the ground.
Cheney is one of the few deeply honorable men left in Washington. It's a city that sours people, but Cheney has maintained his basic integrity.