Because he predicted there was absolutely no possible way to bring a victory. It wouldn't take long before those old tidbits were smoking up the internet. Let's get nostalgic...
Do you remember when he said it was a "failed war" and voted against the strategy that brought that victory?
I was being sarcastic, it clearly was not a victory and to decleare victory would have been disengenous and patritonizing to those who died and were injured for America.