Post-presidency
After leaving the presidency in January 1969, Johnson went home to his ranch in Stonewall, Texas. In 1971, he published his memoirs, The Vantage Point. That year, the Lyndon Baines Johnson Library and Museum opened near the campus of The University of Texas at Austin. He donated his Texas ranch in his will to the public to form the Lyndon B. Johnson National Historical Park, with the provision that the ranch "remain a working ranch and not become a sterile relic of the past".
Johnson gave Nixon "high grades" in foreign policy, but worried that his successor was being pressured into removing U.S. forces too quickly, before the South Vietnamese were really able to defend themselves. "If the South falls to the Communists, we can have a serious backlash here at home," he warned.
During the 1972 presidential election, Johnson endorsed Democratic presidential nominee George S. McGovern, a Senator from South Dakota, although McGovern had long opposed Johnson's foreign and defense policies. The McGovern nomination and presidential platform dismayed him. Nixon could be defeated "if only the Democrats don't go too far left," he had insisted. Johnson had felt Edmund Muskie would be more likely to defeat Nixon; however, he declined an invitation to try to stop McGovern receiving the nomination as he felt his unpopularity within the Democratic party was such that anything he said was more likely to help McGovern. Johnson's protégé John Connally had served as President Nixon's Secretary of the Treasury and then stepped down to head "Democrats for Nixon", a group funded by Republicans. It was the first time that Connally and Johnson were on opposite sides of a general election campaign.
In March 1970, Johnson was hospitalized at Brooke Army Medical Center in San Antonio, after suffering an attack of angina. He was urged to lose considerable weight. He had grown dangerously heavier since leaving the White House, gaining more than 25 lbs and weighing around 235 lbs. The following summer, again gripped by chest pains, he embarked on a crash water diet, shedding about 15 lbs in less than a month. In April 1972, Johnson experienced a massive heart attack while visiting his daughter, Lynda, in Charlottesville, Virginia. "I'm hurting real bad," he confided to friends. The chest pains hit him nearly every afternoon – a series of sharp, jolting pains that left him scared and breathless. A portable oxygen tank stood next to his bed, and he periodically interrupted what he was doing to lie down and don the mask to gulp air. He continued to smoke heavily, and, although placed on a low-calorie, low-cholesterol diet, kept to it only in fits and starts. Meanwhile, he began experiencing severe stomach pains. Doctors diagnosed this problem as diverticulosis, pouches forming on the intestine. Also symptomatic of the aging process, the condition rapidly worsened and surgery was recommended. Johnson flew to Houston to consult with heart specialist Dr. Michael DeBakey, who decided that Johnson's heart condition presented too great a risk for any sort of surgery, including coronary bypass of two almost totally destroyed heart arteries.
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