From the Chicago Tribune:
White House press secretary Tony Snow said the president and vice president are not executive “agencies” and are therefore not covered under the executive order, but he stopped short of placing Cheney exclusively in the legislative branch. Snow He said the vice president has served “in an executive capacity delegated to him by the president” and noted that, constitutionally “there are no specified executive activities for the vice president,” and that his role “is a wonderful academic question.”
The executive Power shall be vested in a President of the United States of America. He shall hold his Office during the Term of four Years, and, together with the Vice President, chosen for the same Term, be elected, as follows . . .