The election is long over. A new year is starting, and even most of the more ardent liberals are moving on. But in Louisburg Square this week, one determined group isn't quite ready to let go. About a half dozen supporters of John Kerry are holding vigil in front of his house, still hoping for a Kerry presidency. The little knot of demonstrators, calling themselves the Coalition Against Election Fraud, stood shivering in the cold yesterday, hoisting signs and pressing fliers into the hands of bewildered passersby. Taxi drivers, neighbors digging cars out of the snow, and Beacon Hill residents...