WWII Opinion polling
Yes, they had opinion polling back in the 40's. And unlike the current war, WWII polled pretty well. Maybe because we had achievable objectives, the backing of allies, and a president not in the grip of batshit crazy beliefs. As Josh Marshall points out, many war defenders says that if WWII and FDR were polled as much as Iraq and Bush, similar disapproval would be seen. As you can tell from the graph, that is utterly false.