Of 40 cities with populations of 300,000 and more, Mr. Kennedy carried 26 and Mr. Nixon 14.
There are eight states in which the largest urban vote can be the balance of power in any close election.
These are New York, Pennsylvania, Michigan, Maryland, Missouri, New Jersey, Illinois and Minnesota.
In 1952 Mr. Eisenhower won all but Missouri.
Yet, in 1960 all eight gave majorities to Mr. Kennedy.