Grok on the source in context:
Original Source: Inside the White House: The Hidden Lives of the Modern Presidents and the Secrets of the World’s Most Powerful Institution by Ronald Kessler (1995), page 33. 
Preceding Paragraph: MacMillan said Johnson, then a senator, had instructed him to give out a pocketful of pens to people — even if he had to throw them onto the ground to do so — when they were touring by bus. 
Paragraph with Quote: During one trip, Johnson was discussing his proposed civil rights bill with two governors. Explaining why it was so important to him, he said it was simple: “I’ll have them n*****s voting Democratic for two hundred years.” 
Antecedent Paragraph: “That was the way he saw it,” said MacMillan, who said he was present during the conversation. “He thought that was the way it was.”
Edited for the faint of heart. Can’t have furry getting the vapours. She might break a nail in the fall.