Opposing Bush is unethical.
Yesterday, several students at ECU stood around holding up signs saying 'Defeat Bush! Defeat fascism!' In the footer text, one finds, 'A student eyewitness said while he thought their actions were unethical, he supported the fact that they were excercising freedom of speech'. No mention of what moral rule they were violating. Maybe there's another formulation of the categorical imperative of which I'm unaware.