Senator Lieberman believes in torture because "It [water boarding] is not like putting burning coals on people's bodies...."

Rachel Kah-Troster writes:

Judaism teaches us that we are all created in the image of God, that respect for the inherent dignity of another person trumps many other mitzvot. Under Jewish law, one’s own words cannot be used against oneself for conviction of a crime; how much the more so information obtained via torture.

And this:

The Torah commands us to protect the stranger more times than it tells us what to do about Shabbat or kashrut. This includes the strangers in U.S.-custody being held without trial, being subject to harsh interrogation techniques, and being subject to a technique which even our Attorney General has said he would consider to be torture if he had to undergo it (though he refuses to rule it out).