It's the methodology of never regretting anything and never acknowledging error that brings it home. And Coulter, of course, got it from Limbaugh. I'm thinking of Coulter's quote from a while back:
“My only regret with Timothy McVeigh is he did not go to the New York Times Building.”
She was then given an opportunity just to say she regretted the outburst. This is what she came up with:
RE: McVeigh quote. Of course I regret it. I should have added, “after everyone had left the building except the editors and reporters.”
Now think of Bush's inability to think of a single mistake he had ever made - after launching a war on false pretenses and authorizing torture as a legal tool. It's the mindset of constant attack. Politics becomes impossible because of it.