George Gallup, of Gallup Poll fame, NEVER voted in a Presidential election but he remains a major influential figure on modern popular polling methods and standards. He created a stir in accurately predicting the 1936 Presidential election (for FDR) and in predicting that another major polling organization would be wrong in saying that Alf Landon would win. In 1948, he, along with others, suggested that Dewey would beat Truman, but he was famously wrong, of course. His polling inexplicable ended two weeks before Election Day that year!
He lived in New Jersey (yet another famous resident) for many years and spent summers in Europe. Gallup is buried in Princeton Cemetery.