Robert Kaplan explains the significance of Petraeus’s promotion:
…the personnel changes indicate that the administration is desperate to show enough improvement in Iraq by the end of the year that an incoming Democratic president wouldn’t dare reduce troop levels precipitously and risk being blamed for a dramatic security meltdown. To wit, these appointments demonstrate that, irrespective of who will be the next president, the presidential transition has already begun — on this administration’s terms.
The Dish 