Which one of the following holds the record for the longest continuously running presidential nominating convention in U.S. history?

The 1924 Democratic National Convention, also called the Klanbake, held at the Madison Square Garden in New York City from June 24 to July 9, 1924, took a record 103 ballots to nominate a presidential candidate. It was the longest continuously running convention in United States political history. It was the first major party national convention that saw the name of a woman, Lena Springs, placed in nomination for the office of Vice President. It was also known for the strong influence of the Ku Klux Klan. John W. Davis, initially an outsider, eventually won the presidential nomination as a compromise candidate following a virtual war of attrition between front-runners William Gibbs McAdoo and Al Smith.

Davis and his vice presidential running-mate, Charles W. Bryan of Nebraska, went on to be defeated by the Republican ticket of President Calvin Coolidge and Charles G. Dawes in the 1924 presidential election.