I actually can't find a good equivalent to Obama in LOTR. I sincerely believe he's a puppet in way over his head but also that he is not misguided or ignorant; he truly desires evil for our land. Kind of like if Wormtongue got elected Steward of Gondor.
The best equivalent for Obama I can find is Lotho Sackville-Baggins (a/k/a Pimple), but it’s pretty limited.
Perhaps the Mouth of Sauron, who speaks to Aragorn and the others outside the gates of Mordor?