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The strongest response that Bush can provide to those who charge him with crimes related to torture, will be to explain; what was done, why it was done, and the benefits from those actions.
To date, there is much we don't know. We don't have access to all of the intelligence.
I don't think obama will want us to have that intelligence.
Maybe some of it (the part that makes Bush look bad) but not the stuff that could cause fear, or worse (to democrats), justify in the minds of voters, the harsh interrogation tactics that were employed.
I personally believe that Bush acted to protect us. Whether he actually did, I can't prove (nor disprove). One reason I believe this to be Bush's motivation is that I don't see that Bush received any type of personal gain from harsh interrogation tactics. None whatsoever.
A full and open investigation could provide an answer to Bush's motivation.
Don't expect the democrats to lead that investigation. It's not in their interest.