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Is this not the goal of an opinion writer, to win people over to your side? So what is the complaint?
I think the point being made was that the shift in opinion is due to GW no longer being in a powerful position politically, not because Joe klein read this blog and changed his mind.
Secondly, the first citation of Klein you listed was made in 2002, which is before Klein, as well as most people, knew what was going on in Abu Graib, so how should he be held to account for developing an opinion based on the available facts?
in 2002, Saddam was in control of "Abu Graib". Most people knew what was goig on there then, and it had nothing to do with US treatment of detainess at Guantanamo.