From The Accidental President: Harry S. Truman and the Four Months That Changed the World, by A. J. Baime (HMH Books, 2017), Kindle pp. 49-50:
For years, John Anderson Truman had taken his family to Jackson County town picnics to hear local politicians speak. “Politics is all he ever advises me to neglect the farm for,” Harry wrote Bess. Harry had studied the lives of all the American presidents. His hero was Andrew Jackson, the seventh president of the United States (1829–1837) and the founder of the Democratic Party, for whom Jackson County, Missouri, was named. Jackson’s adventures in war and politics made his life story read like an adventure novel. “I have been tossed upon the waves of fortune,” Jackson famously said. He was the first American president to come from the common people—people like the Trumans. “If Andrew Jackson can be President, anybody can!” was a common quip of Jackson’s day.
In the fall of 1912 the presidential election was the talk of the Truman dinner table for weeks. Not in Truman’s lifetime had an election been so bitterly fought. A schism tore apart the Republican Party. The incumbent president, William Howard Taft, had won the nomination, leading a humiliated Republican opponent, Theodore Roosevelt, to strike out independently. With his newly created Bull Moose Party, his magnanimity, and his wild oratory style, Theodore Roosevelt riveted Americans. The Democrat Woodrow Wilson had only two years of political experience, and none in national politics. Less than a month before the election, a would-be assassin fired a gunshot into Theodore Roosevelt’s chest, the bullet passing through the pages of a speech he was about to give. With the bullet lodged less than an inch from his heart, he delivered the speech, then went to the hospital and survived. Two weeks later Vice President James Sherman died, leaving the Republican Taft with no running mate.
“Nobody talks anything but election,” Harry wrote Bess on November 6, the day after the contest, which Wilson won, becoming the twenty-eighth president of the United States. The brutality of this election made Truman philosophical about his future and politics itself, especially when his father threw his hat in the ring, running and winning the local office of road overseer.
“Politics sure is the ruination of many a good man,” Harry wrote Bess. “Between hot air and graft he usually loses not only his head but his money and friends as well. Still, if I were rich I’d just as soon spend my money buying votes and offices as yachts and autos. Success seems to me to be merely a point of view anyway . . .
“To succeed financially,” Harry concluded, “a man can’t have any heart. To succeed politically he must be an egotist or a fool or a ward boss tool.”