 However, their marriage only lasted about a year.His second marriage in 1932 to Leslyn MacDonald (1904–1981) lasted for 15 years.MacDonald was, according to the testimony of Heinlein's Navy friend, Rear Admiral Cal Laning, "astonishingly intelligent, widely read, and extremely liberal, though a registered Republican", while Isaac Asimov later recalled that Heinlein was, at the time, "a flaming liberal".