The way I figured it, this is the best thing that could happen to the Democrats. The way things were, Bush was an extremely popular president who could blame all of his problems on the Democrats. If he kept us in wars, there wouldn't be much of a way to beat him.
Now, Bush has no excuses. He'll have to answer for every problem he causes.
Besides, without a 60 seat majority, the Republicans can't screw up the country too badly.