These nine elections constitute half of the eighteen midterm elections held since 1945; in several of the non-wave midterm elections, the president's party did not control Congress but nonetheless lost several seats.
These nine elections constitute half of the eighteen midterm elections. These eighteen midterm elections are held since 1945. The president's party did not control Congress. This was in several of the non-wave midterm elections. The president's party nonetheless lost several seats. This was in several of the non-wave midterm elections.