Ian M. MacIsaac: Sudden resignation of CIA director David Petraeus leaves unanswered questions and ruined careers

  The revelation of David Petraeus's extramarital affair with his biographer Paula Broadwell has dominated post-election Washington and news media, and brought President Obama's reelection honeymoon to an abrupt end.

  Many have exhibited shock at the sudden downfall of one of America's most decorated and celebrated generals and national security leaders. Even more have questioned why a full-on FBI probe was necessary to uncover something that had more to do with the CIA director's personal life than any issue of national security.