Wave elections in the United States
election in which a political party makes major gains / From Wikipedia, the free encyclopedia
In political science, a wave election is one in which a political party wins a lot more than the other. In the United States, there is no agreement of how many wins are needed to be called a wave election.[1][2][3]
Congressional incumbents in the United States have an advantage over challengers, but a wave election often helps challengers. This results in many more incumbents losing than usual during wave elections.[1]