FILE - In this July 21, 2008 file photo, then-presidential candidate Barack Obama, left, and then-top U.S. military commander in Iraq, David Petraeus, take a helicopter ride over Baghda

 

              FILE - In this July 21, 2008 file photo, then-presidential candidate Barack Obama, left, and then-top U.S. military commander in Iraq, David Petraeus, take a helicopter ride over Baghda
FILE - In this July 21, 2008 file photo, then-presidential candidate Barack Obama, left, and then-top U.S. military commander in Iraq, David Petraeus, take a helicopter ride over Baghdad's Shiite enclave of Sadr City, Iraq. Petraeus, the retired four-star general who led the U.S. military campaigns in Iraq and Afghanistan, resigned Friday, Nov. 9, 2012 as director of the CIA after admitting he had an extramarital affair. (AP Photo/Ssg. Lorie Jewell, Pool, File)