FILE - In this June 24, 1948, file photo, A lei about his shoulders, Governor Thomas E. Dewey of New York smiles at cheering delegates as he appears on the speakers's stand in convention hall in Philadelphia on June 24, 1948 to acknowledge his nomination as the GOP standard bearer for the election. It was 1948 when Dewey won the Republican presidential nomination on the third ballot of a contested convention in Philadelphia. Months later, he lost the general election to Democratic incumbent Harry S. Truman. Could a real contested convention happen again, 68 years later? (AP Photo/File)