One day not long after American troops entered Cambodia, the usual complement of tourists, strollers and protesters in Washington's Lafayette Square were startled to see a swarm of black limousines pull out of the White House gates, wheel around the corner and descend on A.F.L.-C.I.O. headquarters. President Nixon, maps and charts in tow, had come to explain his Cambodian policy to the executive labor council. He thus made a parlor call in a continuing courtship that Republicans hope will erode the Democratic Party's traditional base among working men and women.
That there are votes up for grabs was confirmed two weeks...