"The oath of office for the president is set out in the Constitution.
Article II, Section 1, states as follows:"Before he enter on the execution of his office, he shall take the following oath or affirmation: -- "I do solemnly swear (or affirm) that I will faithfully execute the office of president of the United States, and will to the best of my ability, preserve, protect, and defend the Constitution of the United States."
Traditionally, two minor changes are made. First, the president taking the oath says his name after the first word ("I, Barack Hussein Obama"). And second, the phrase "so help me God" is added at the end. "