Like in Spitzer's case? He's still a nut job. Even a broken clock is right twice a day.
Well, sometimes princple requires you to protest government abuses against citizens you and I and many others detest. (I'm referring to American citizens here, not enemy combatants.) That holds even if the targeted individual may be a government scoundrel himself.
I don't have enough details about the wiretapping on Spitzer at the present time to agree or disagree with Paul as to whether Spitzer's rights were violated.