If Bush Took a Mulligan on the Three Mistakes Question...
If he weren't a moral coward, he might say:
I regret that I did not anticipate nor prevent the attacks of September 11th, and I deeply, deeply regret the loss of those 3000 lives on that horrific day. It happened under my watch.
I regret the intelligence failures prior to the Iraq War, and I will do everything in my power to prevent such a failure in the future. It happened under my watch.
I regret the atrocities at Abu Ghraib. It happened under my watch. I bear full responsibility.
But of course he would never say any such thing.