The Midterm Elections in the United States are held every four years - two years after Presidential Elections - which also run every four years. These Congressional Elections are referred to as the Midterms because they occur during the half-way point of a Presidential term. During the Midterm Election, every single member of the House of Representatives is up for re-election (House members only serve two-year terms so they are also up for re-election during Presidential Elections). Also, one-third of United States Senators are up for re-election too. There are also several elections at the state-level too. Historically, the party that controls the White House does poorly during the Midterm Elections - so the party out of power - usually picks up several seats in Congress.