Barn·burn·er n.
 1. A member of the radical section of the Democratic party in New York, about the middle of the 19th century, which was hostile to extension of slavery, public debts, corporate privileges, etc., and supported Van Buren against Cass for president in 1848; -- opposed to Hunker. [Political Cant, U. S.]

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 barnburner
      n 1: someone who burns down a barn
      2: a impressively successful event; "the rock concert was a
         real barnburner"