As someone who recently read the New Testament, I can safely say that, in my opinion, the Book of Revelation is one of the longest drug-induced rants I've ever seen.
Since the entire script is so fantastic and vague (probably intentionally), it can be - and still is - interpreted in a million different ways, and every single Christian faction on the planet has built their own little apocalypse scenarios based on it - even when the Bible states that humans will not see the end until it's upon them, try as they might. Not to mention that anything in that particular piece of writing makes even less sense than most biblical prophecies - which are only educated guesses until they become verifiably true, even in their original context.
I strongly urge anyone who reads it to either ignore the Revelation in its entirety, or at least take it with a truckload of salt.
As for Obama - even if one believes Revelations to be true, I can't really see how someone could make him out to be the Antichrist, unless for political and/or derogatory purposes.
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