No, I don’t think that the Democrats voted for the war. That was not a declaration of war. They gave the president the option to go to war because they did not want to restrain the executive and thus give the appearance of supporting the ennemy. Had they voted against that resolution, Bush would still have gone to war and would have labeled them as defeatists. It was the Administration’s job plan the war and it’s aftermath. Legislators can only do oversight of executive but the Republican-held Congress did not even do that. Remember, Republicans controlled the legislative agenda.