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Thomas Hart Benton (March 14, 1782 – April 10, 1858), nicknamed "Old Bullion", was a United States Senator from Missouri. A member of the Democratic Party, he was an architect and champion of westward expansion by the United States, a cause that became known as Manifest Destiny. Benton served in the Senate from 1821 to 1851, becoming the first member of that body to serve five terms.