 Originally written as a waltz , Blake rewrote the number as a foxtrot at the singer 's request . The result was a simple , direct , joyous , and infectious tune enhanced onstage by improvisational dancing . In 1948 Harry S. Truman selected " I 'm Just Wild About Harry " as his campaign song for the United States presidential election of 1948 . Its success in politics led to a popular revival . 
