CIA Director and retired Army General David H. Petraeus, the accomplished battlefield commander credited with turning around American fortunes in Iraq before retooling the military strategy in Afghanistan, resigned in disgrace on Friday after admitting to an extramarital affair that some experts suggested could have compromised national security. The news of his resignation came as a shock to official Washington and across the country, where the 60-year-old general-turned-top spy has been regarded as a national hero, feted at the Super Bowl and even talked up as a possible future candidate for the presidency.
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