what does "the Connally-Yarborough feud" mean?
And on the opposite side of the mansion, on West Executive Avenue, Dean Markham had been watching the boarding and the flight with Don Ellinger, a visitor from Texas. “I didn't know O'Brien and O'Donnell were going,” Markham said absently. “Of course,” said the Texan. 'It's a political trip.” He described the Connally-Yarborough feud and added, as the gigantic wasps disappeared into the overcast, “This is a trip the President can't win, no matter what happens.”