Makes me glad I've been doing that ritual! Wish I could have done it with others on june 29th. Ah well...
Ehh, it's possible theoretically to influence Obama. However, I wouldn't touch it, since he's the focal point of whoever is running the world. He's probably very protected spiritually.
On the other hand, he's also not as powerful as we think. These are people who have been running america for quite some time, if he pulled a Kennedy/Lincoln, I doubt he would get as far as they did. Best to simply leave it in the hands of Father Satan.