In just a few days, President Barack Obama and Mitt Romney's positions on economic and social issues will fade from public memory as attention turns from the presidential horse race to the business of governing.

But the public is unlikely to forget Romney's “47%” comment anytime soon. It's an election game-changer, much like John Kerry's “I voted for it before I voted against it” remark, Michael Dukakis' botched tank photo-op, and Gerald Ford's baffling statement about Soviet dominance of Eastern ...