lol, I'm just going to take a wild stab at this, but I think this new 'war' is just a distraction from his party's failings. After all, nothing says votes quite like humanitarian aid. It's happened quite well around here in Aus, and I'm sure Obama was thinking that a lot more people would back him in the next election if he got involved with someone else's problems in another country. That's how Bush did it in Iraq, but I think he had a lot more ground for his reasoning. And no, not just for oil.
If it's a 'distraction' they've pulled the Trigger a Year too Early... by November 2012 it will have become another Iraq/Af-Pak Black Hole, sucking Money and Soldiers... Not what the Party of the Incumbent wants to have thrown in it's face.
meanwhile Obama is being death threatened not to run for a 2nd term while Al Gore starts a global warming conglomerate that seizes control of the world. the New World Order, headed by Gore himself! lol