This is why they were elected, for better or for worse.
Not really. There were lots who wanted someone other than Rumsfeld to run the DOD but not to 'cut and run'. The Democrats didn't run on a unified platform in 2006 the way the Republicans did in 1994. DemocRATS will have a smaller majority in the House than the Republicans currently have. Furthermore, when the DemocRATS last had control they had much larger majorities. I'm not sure they know how to run it on a 24 seat majority.
And if - IF - they that elected were right then we shouldn't wait to cut and run. Four more months of American deaths for which the demos might be responsible is too much. Get out now! IF the demos were right.