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Francis S. Thayer (1822–1880) was an American merchant and politician from New York. He served as a member of the New York State Senate from 1868 to 1871. He was the sole member of the Republican Party to vote against the Tweed Charter, through which Grand Sachem of Tammany Hall William M. Tweed consolidated power among his political allies.Photograph: Charles Burt; restoration: Andrew Shiva