I'm not saying he is or he isn't because I don't know.

But when the anti-christ does show up on the sign (whether it be Obama or someone else) don't be surprised if most people follow after him.

and all who dwell on earth will worship it, everyone whose name has not been written before the foundation of the world in the book of life of the Lamb who was slain.
(Revelation 13:8 ESV)

Seems that the only people who WON'T follow after the anti-christ will be those whose names are written in the book of life.