Thomson ReutersA woman walking past Nissan Motor Co.'s GT-R is reflected on the company logo of a vehicle at its showroom in YokohamaBy Bernie WoodallDETROIT (Reuters) - Nissan Motor Co has rejected a U.S. State Department offer to mediate a dispute between the company and the United Auto Workers over claims of anti-union practices as the UAW tries to organize workers in Mississippi.The UAW was joined by...