Both for continuing the military intervention and for not bringing anyone to trial, nor even a public accounting, for cooking up the false claims used to justify the invasion; nor for the torture; nor for the killing of civilians; nor for the use of depleted uranium and white phosphor; etc.
2008 brought a Democrat president along with an increased Democrat majority in both houses, so if they weren't faulted at the time (and they were) then they were certainly faulted just a few years later.