The last time the US looked to the Left and the Democrats to define what was a civil war and when we were "defeated", was during the Viet Nam War. Back then, they said that the Viet Nam War was simply a civil war that we shouldn't be involved in. Of course that was completely wrong, and the movement of the NVA into Laos and Cambodia shortly after their victory in the south put the proper face on what the war really was about.
The Left and the Dems (and a TV News Anchor...sound familiar?) declared our defeat after the Tet Offensive, and of course that was also completely wrong. The Tet Offensive was a stunning military defeat for the Viet Cong. Though US deaths spiked at that time, the Viet Cong deaths were even more horrendous and they ceased to exist as a military formation from that time on. All the fighting after that point was conducted by the NVA.
The end result of the Left's and Dem's inability to understand warfare at even the most basic level, and their outright cowardice, was that they believed we were defeated in Viet Nam and that our best option was to cut and run (is any of this sounding familiar yet?) Which we did. After we abandoned the South Vietnamese, the ensuing fight and political cleansing resulted in over 2.5 million Vietnamese, Cambodians and Laotian deaths, twenty straight years of political upheaval in those three countries, and almost thirty years of economic stagnation.
The Left and the Dems have never acknowledge that they were wrong about Viet Nam. I'd say the opposite is true; they view their opposition to the Viet Nam War and our abandonment of the Vietnamese people as a shining star in their past that guides their every movement today. Why we would be looking to that group to define and set a course for the Iraq War is completely beyond my ability to comprehend.