I'm at an odd point in the "Justice" Bybee saga.
If the review of the OLC memos finds that Bybee was incompetent, that the ignoring of relevant precedents was a result of gross legal negligence, then I think it appropriate to hold impeachment hearings to get him removed from the bench.
If, on the other hand, the review determines that he was acting as a partisan cog in the Bush machine, and that the ignoring of relevant precedents was a result of political pressure from the White House and his own moral cowardice in standing up to that pressure, then I think the case to impeach him dies.
There's nothing saying judges can't be partisan tools (insert SCOTUS punchline here). Only that they be legally competent partisan tools.