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. John W. Davis, initially an outsider, eventually won the presidential nomination as a compromise candidate following a virtual war of attrition between
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https://en.wikipedia.org/wiki/1924_Democratic_National_Convention