The Republican Party lost its Senate majority in 2001 when the Senate became split evenly; nevertheless, the Republicans maintained control of the Senate due to the tie-breaking vote of Republican Vice President Dick Cheney. Democrats gained control of the Senate on June 6, 2001, when Republican Senator Jim Jeffords of Vermont switched his party affiliation to Democrat. The Republicans regained the Senate majority in the 2002 elections. Republican majorities in the House and Senate were held until the Democrats regained control of both chambers in the mid-term elections of 2006.