In the 1980s, Dan Rather was mocked for ending his newscast with the single word "courage." As if to defy his critics, Rather said it one more time last night. The anchor of The CBS Evening News finished his 24-year run facing the camera alone. And he made a short statement of farewell. To Sept. 11 survivors, tsunami victims, American troops, the sick, the oppressed and journalists in dangerous places, Rather said, "Courage."