A would-be assassin's bullet was slowed by Roosevelt's dense overcoat, steel-reinforced eyeglass case and hefty speech squeezed into his right jacket pocket. Theodore Roosevelt’s opening line was hardly remarkable for a presidential campaign speech: “Friends, I shall ask you to be as quiet as possible.” His second line, however, was a bombshell. “I don’t know whether you fully understand that I have just been shot.” Clearly, Roosevelt had buried the lede. The horrified audience in the Milwaukee Auditorium on October 14, 1912, gasped as the former president unbuttoned his vest to reveal his bloodstained shirt. “It takes more than that...