Theodore Roosevelt was shot in the chest as he left a hotel in Milwaukee on October 14, 1912, on his way to give a campaign speech. He was running for president again, on the new Progressive ticket after losing the Republican nomination to Taft. The gunman fired once at close range. The bullet passed through the folded text of the speech in his breast pocket and through a steel eyeglass case, and it lodged in his chest. It did not kill him.
He did the thing he is remembered for. He refused the hospital, decided the wound was not to the lung because he could speak without blood in his mouth, and went to the hall and spoke for about ninety minutes, opening his coat at the start to show the audience the blood. He told them it takes more than a bullet to stop a bull moose, a line from his own campaign, which had taken the moose as its emblem. Then he let himself be taken to hospital.
The shooter was John Schrank, a New York saloonkeeper with a history of delusion, who said afterwards that the ghost of William McKinley had told him to stop Roosevelt taking a third term. He was judged insane. He was committed. The bullet was never removed, and Roosevelt carried it for the rest of his life. The wound forced him off the campaign for two weeks, in the middle of a close race.
He came third. The election of 1912 was won by Woodrow Wilson, because the Republican vote was split between Roosevelt and Taft, the president Roosevelt had picked and then abandoned, and the two of them together outpolled Wilson while handing him the office. Roosevelt's showing, second with the most votes any third-party candidate had won, is still the ceiling for an independent run at the White House.