If we are unable to complete this war, it is unlikely we can undertake any successful war in the future. Our enemies will have tagged us correctly as having no stomach for battle. We will become a bigger target than ever before.
We will be able to... but before we have to fight again we will lose a whole lot of material, lives, and international capital.
All for the sake of democrat power.
"it is unlikely we can undertake any successful war in the future"
Forgot your history? Back in the early 70's Congress basically did the same thing and we "lost" in Vietnam. But 20 years later we were back in play after the first Gulf War.
Of course, the Muslims will have defeated us by 2026 at this rate.