The 1957 launch of Sputnik, the Soviet satellite all too visible in the evening sky as it passed over the United States, heightened worries that the Soviet Union was pulling ahead in an economic race widely regarded as a referendum on the merits of rival political systems. Kennedy played on those fears in the 1960 presidential race, promising to increase economic growth to an annual rate of 5 percent - roughly twice the average pace during the second half of the 1950s.