There are several sign to look for in the anti-christ. We know he will be a ruler of some sort. He comes in conquering and to conquer, but with only a bow and no arrow. That means (and Daniel Book backs up) that he will come in with flattering words and will conquer with his words. He will be more like a Hitler type individual.
Is Obama the one? Over the years many individuals have been singled out, without real substance. I think it wrong to call someone the anti-christ without real evidence. We must wait to see what develops.