Article 3, Section 3 of the US Constitution:
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.
The Congress shall have Power to declare the Punishment of Treason, but no Attainder of Treason shall work Corruption of Blood, or Forfeiture except during the Life of the Person attainted. (emphasis added)
Anwar al-Awlaki, a US citizen, was targeted for assassination after being placed on a secret presidential kill or capture list. This is clearly unconstitutional (see above). President Obama, a former constitutional scholar, is clearly aware that his actions are outside constitutional bounds.
The Atlantic has an article up today discussing this issue.
I have created a petition at whitehouse.gov demanding that the Obama regime release the Justice Department memo authorizing the extra-judicial killing of al-Awlaki, I would appreciate you taking the time to sign the petition.