Mark Steyn's brief in National Review Online is spot-on. The 2004 ratified the Iraq policy, which was either "solved" by 2006 or Republicans would be turned out.
The current era demands quick wars, and God forbid we sustain casualties prior to an election. Foreign policy is still the perogative of the Executive branch, and that will last until 2009, when the Shiites and Sunnis will revert to killing each other without us as spectators.