Does he has to resign??

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["The day Petraeus resigned, I received an email from an Arab intelligence contact who expressed what surely has been going through the minds of many people around the world. I will quote it precisely, punctuation and all: "He needs to resign cause he has an affair? What da hell??? He is brilliant!!!! Why like this????"]
http://www.realclearpolitics.com/article...16197.html