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About one-third of the Senators in Congress are elected every two years. This means the 33 are up for election at any one time.
All 435 House seats - Representatives or Congressmen/women â are up for election every two years (in even numbered years, 2002, 2004, 2006, etc.). Senators are elected for six-year terms. Unlike the House where everyone is up for re-election at the same time, every two years about 1/3 of the Senators are up for re-election. In 2008, 33 seats are up for election.