In their efforts to discredit the Bush Administration on the issue of torture and waterboarding, Democrats thought that they would selectively release CIA memos that inferred authorization all the way to the top. In so doing, Dems also were hoping to rein in the CIA. Of course, this all came back to bite them in the ass. The CIA - along with top Bush people including VP Dick Cheney - have all come forward to request that a broader group of documents be released in order to provide context as well as to show the number of people who actually knew about it.
People who live in glass houses...
Best summary of the story so far: From Jed Babbin, editor with Human Events.
And check out this debriefing sheet released by the CIA: