Death at the top; the one-shot plebiscite
In real life, unlike in the movies, the more a man is a hero, the more likely he is to die or be killed. A quarter of American presidents have died in office, many by assassination. Almost every liberal, charismatic male leader of the 1960s through the 80s was assassinated or mysteriously killed. Not just the Kennedys, King, and Malcolm X of the United States, but Salvador Allende of Chile, Patrice Lumumba of the Belgian Congo, Olaf Palme of Sweden, Anwar Sadat of Egypt, and Dag Hammarskjold of the United Nations. They were all "done away with" when someone perceived that the role they were playing was no longer proteaing their interests. Assassination, the modern-day equivalent of regicide, has left many male leaders giving their lives for their country in politics just as men do in the military. Thus today the male leaders are buried, their wives are alive.
With the exception of Indira Gandhi, female leaders have not been assassinated in recent history. It is much more common for a woman to come to power after her husband’s assassination than to herself be assassinated. Corazon Aquino became president of the Philippines after her husband was assassinated; Violeta Chamorro was elected president of Nicaragua after her husband was similarly slain; and Benazir Bhutto was elected prime minister of Rikistan after the assassination of herfather (only a slightly different twist).