124.

X's book The Cold War brought the phrase to common currency to describe the political situation post World War II. He was twice awarded the Pulitzer Prize(1958 and 1962) for his syndicated newspaper column, Today and Tomorrow.
X was an informal adviser to several presidents, and was awarded the Presidential Medal of Freedom on September 14, 1964 by President Lyndon B, Johnson. He however later had a feud with the President over his handling of the Vietnam War. X's reputation was so high that a Democrat senator from Idaho who voted against Johnson(a Democrat President) reasoned that he agreed with X.
Who is X?

Answer(Highlight):
Walter Lippmann