Perhaps Ronald Reagan's best performance as a movie star came in "Kings Row," released in February of 1942, months before he joined the military. But in some sense the formula for his greatness as president of the United States is captured in a line from the Herman Hupfeld song "As Time Goes By," which Dooley Wilson brought to the silver screen in "Casablanca" later that year. Reagan's name was (falsely) linked to the role of Rick in "Casablanca" that eventually turned Humphrey B...