Much attention is lavished on the election-year "battleground states," the 10 or so states commonly thought to be the places that will determine the outcome of the presidential contest.
But let's consider for a minute the role that could be played by a smaller group of states—call them the game-changers. These are four reliably blue states where Mitt Romney's campaign thinks it has a chance to pull off an upset. A Republican win in any one of these four would signif