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Pick one or more of the following:
1) The Democrats don't want to appear "soft on terror".
2) Like most politicians, they are lazy, and would prefer that Bush be allowed to go away after a year and a half so they can help their party win big in 2008.
3) What I believe to be the case: some of them secretly approve of unchecked power, but simply disapprove of a Republican wielding it. They are therefore uninterested in actual investigations that would unearth and limit such power.