You saw a picture of someone..  Irregardless of what you think you know, I honestly don't understand how you could sit here and say that the person in the picture you saw was 100% Michelle Obama, as if you were able to DNA test a fucking picture or something...  Let's be logical here... The statement should be that "you've seen a picture of a man in his twenties you believe to be her"... That would be the only way this could be a factual sentence.