If I was Obama's Feng Shui consultant...
The first task is to clear out all of the old "predacessor chi" from the entire White House paying special attention to the Oval Office. A Feng Shui Blessing Ceremony using ingredients such as dried mandarin peels (chen pi), fresh oranges, cinnabar, Tibetan singing bowls, sandalwood incense and white rice would clear out the negative chi and bring in fresh, renewed auspicious energy.
Next, let's move his desk into the Command Position by putting him in a new (no predacessor chi, again!) high-backed chair for his new desk; placing his back on a solid wall by moving the desk away from the window and placing it on the wall on the left-hand side.
Also, let's block off three of the four (!) doors coming into the office leaving the upper right hand door working and turning that into the "Mouth of Chi" so his desk is now in the power position. Too many doors in a room cause erratic energy and disapate the life-force.
This now places the entry into the Oval Office in the Helpful People area so everyone who enters can now become a Benefactor to him. I would place a brass shop-keeper's bell on the inside of the door so it keeps activating the Helpful People energies everytime the door opens.
Now we need to add life-force to the room with some color (golds, yellows, oranges); lots of healthy green plants and trees; and a water feature in the Prosperity Corner of his office.
He should also surround himself with art, imagery and symbols of his campaign mission so that everytime he looks up from his desk, he is seeing his future made manifest.
Lastly--and most importantly--I'd have him do Secret Transcendental Feng Shui Cures to support and increase his vitality, protection and safety, benefactors, prosperity, clarity, strength and wisdom.