Barack Obama rocks XXI: Why is he refusing to release his birth certificate?

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(Tim) Some claim Obama has already released his birth certificate. But Factcheck is a pretty poor place to lodge his defense. On the left is a vault copy of his BC making it clear why Democrats and Republicans alike are raising questions (comments below LATimes piece).

The simple challenge made at the end of this video remains unanswered. McCain's released everything requested. Why does Obama refuse to do so?