The key to it all is the issue of reasonable doubt. Fitzgerald has to convince all the jurors that Libby is guilty beyond a reasonable doubt on at least one of the charges. The defense has to meet a lesser standard; all it must do is convince jurors that there exist reasonable doubts about the prosecutor’s case. Given the series of memory lapses, changed testimony, and conflicting stories that have been presented in the courtroom, that is something the jury has had plenty of chances to believe.
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