First of all, the 3 or 4 articles of yours I read we're all conjecture...not exactly the results of a scientific study. Googling "famous people who plagiarized" is not research. Saying that Ambrose plagiarized because he didn't put quotes around a particular paragraph, for exams, is pretty queepy. And I've never swung off of anything of his.
Second, If you believe the article (did you even read it?), Obama didn't plagiarize anyone else's work...he just had somebody write the book for him. That happens all the time. Being angry over that will do about as much good as worrying about his birth certificate at this point.
Finally, the book didn't make him president. His public speaking, promise of free stuff (healthcare/phones/etc), and his race made him president. Being the democrat option after Bush didn't hurt either.
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