Ron Paul and Savage are correct on this one. Al-Awlaki may indeed deserve to be killed, but only after a trial. Allowing a politician do make that determination rather than a court of law is by definition, terrorism.
The idea that a president can have someone killed on his word, by his decision and not on the decision of a court of law is one of the hallmarks of tyranny. This was the law in the Third Reich.
As Savage says, if Obama can kill al-Awlaki and get away with it, who is safe? If a crackpot like Napolitano can call returning Iraqi veterans "potential terrorists", does than mean the Administration might start targeting them? Or Ron Paul supporters? Or people critical of the Federal Reserve? Or people who are pro-life?
We either have the rule of law, or we have the rule of the dictator.