CONCORD, N.H. - Mitt Romney took the symbolic, time-honored step yesterday of filing his official papers to put his name on the primary ballot in New Hampshire, a state that will play a huge role in his presidential ambitions. Alerts Romney told reporters he was "thrilled to be sitting in the seat my father sat in some 40-odd years ago," referring to George Romney, who unsuccessfully contested the 1968 GOP presidential nomination. "I intend to follow his footsteps to a point," Romney said. "And the point is that I plan on winning the campaign." Romney, the governor of neighboring Massachusetts...