I know that women have been elected as Presidents of many countries in the world, although that has yet to happen in the United States. But has there ever been an instance of a country where a President was elected, and then his or her spouse was elected at a later day to be President? I haven't heard it mentioned one way or another, and am quite curious.
Yes. Argentina had one of those, and a closely related situation.
Also in Argentina, Juan Perón died while in office and was succeeded by his wife Isabel Martínez de Perón, but that does not qualify because she was not directly elected as President (she succeeded Juan Perón because she was the Vice President).