Lesson learned for you, yes, but look around you though at the huge mass of Democrats still supporting Obama, even people who previously marched in anti-war protests during the Bush era. Most of the time, for most of the people, the lesson is not learned at all. Has Romney's nomination just four years after Bush left office not proven this? We've already won over about as many of the rational people as we're going to, and we're coming up against diminishing returns there, because most people have entirely different personality types. Now, we're stuck trying to win over the vast majority of people who form their political opinions emotionally based on social cues. In the case of Republicans, a Romney win will not bring them closer to us; instead, it will embolden them to pursue Bush-era policies with greater fervor and fewer doubts. Combined with all of the other consequences the OP listed, a Romney win is the absolute worst case possible result from this election.