This is the guy the right is deriding as comparing Gitmo to Pol Pot and Nazis. I tracked down his statement, it's available here as a PDF. It's a fairly long document (3-4 pages), and it's a pretty good speech. His main point was that we should close down Gitmo, because the abuses there, and because we are not treating the prisoners there by the Geneva Convention. He described some uses of tortue, mainly leaving prisoners chained to the floor in uncomfortable positions, for up to 24 hours, without food, without water, without rest, subject to extremes of temperatures (60F or 100F), or loud rap music. Also he questioned what type of prisoners are there, and if they are really 'the hardest core of the hard core' as Rumsefeld had stated.

All in all, powerful, eloquent arguments. I am not yet convinced, however, that we need to adhere to the Geneva Convention in this case, for the following reasons.

1) None of the enemies that we have fought since the Geneva Convention, actually adhered to it or were a signatory of it.
2) Our troops have been for the most part treated extremely inhumanly by whoever captures, them, while the opposite is true for those we capture. Indeed in the 2nd Iraq war, many of the POWs living conditions were better in the camp than at home, because of the absence of electricty, food, water, etc.
3) The terrorists of today are not a national, standing army, fighting to protect it's territory from US incursion. They are all irregular troops, privately funded, without organized ranks, or a supporting State. Therefore they are not troops in the real sense.

UPDATE: This is real torture, from the Saddam era. Warning, this site contains photos which are graphic and upsetting.