Daniel Ellsberg recounts, on page 338 of the Book "Secrets" a conversation he had on a plane with Maryland Senator Charles Mathias in the dark days of the Nixon White House during the Vietnam War-- A time when Nixon was feeling more and more isolated. "Mathias had known Nixon for a long time as the Republican Senator from Maryland. He had been to the White House a number of times. He said that in recent months he had been disturbed by an increasing sense that the President was becoming "unbalanced." ...what capped his concern was an evening he had spent at the White House recently when he and his wife had been the Nixon's only guests for a quiet dinner. They had been waiting alone in the dining room, near a banquet table set for four when they heard a fanfare of trumpets, followed by a section of the Marine Band playing "Hail to the Chief." The President and Pat Nixon, arm in arm, were proceeding slowly down a staircase to meet their two guests, while the band played. Mathias was very unnerved by the sight. The word he used for the impression the chief executive had made on him was 'insane'."