As the congressional session lurches toward a close, Democrats are confronting some demoralizing arithmetic on Iraq. The numbers tell a story of political and substantive paralysis more starkly than most members are willing to acknowledge publicly, or perhaps even to themselves. Since taking the majority, they have forced 40 votes on bills limiting President Bush’s war policy. Only one of those has passed both chambers, even though both are run by Democrats. That one was vetoed by Bush. Indeed, the only war legislation enacted during this Congress has been to give the president exactly what he wants, and exactly what...