 On July 16, 1991, Calvin Warburton became the first sitting legislator to switch parties to the Libertarian Party, and the first Libertarian legislator in the contiguous 48 states.Warburton was serving his seventh term as a Republican state representative in New Hampshire when, at age 81, he switched to the Libertarian Party.In 1992, four Libertarians were elected to the New Hampshire House of Representatives