Lee Mantle was appointed to the U.S. Senate to fill the vacancy in the term commencing March 4, 1893, caused by the failure of the legislature to elect, but was not seated; he was then elected as a Republican to fill the vacancy and served from January 16, 1895, to March 3, 1899. He was an unsuccessful candidate for renomination in 1899, and organized and became chairman of the Silver Republican Party of Montana in 1896, but returned to the Republican Party in 1900. Wikipedia*
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