Maybe this will help.
http://www.washingtonpost.com/world/national-security/holder-defends-keeping-petraeus-inquiry-from-white-house-until-after-election/2012/11/15/76601d62-2f64-11e2-a30e-5ca76eeec857_singlePage.html
Holder defends keeping Petraeus inquiry from White House until after election
Thanks