Try finding a reference to that monniker in any newspaper prior to rumors of MacArthur eying the Whitehouse in '44.
I wish MacArthur had come home in 1944 to run for president. Among Roosevelt's opponents, he would have had the best chance to win. Had he won, Harry Truman would only be known to students of political corruption, Eisenhower would be famous only for his accomplishments in WWII, and the Republican Party's Dewey-Warren faction--the GOPe of the day--would have been out in the cold.