In American federal elections, races for
U.S. Senate tend to be more competitive than those for
U.S. House of Representatives.[3] Even in
wave election years, the vast majority of U.S. House members keep their seats, with little pressure from the opposing party.[4] Competition in U.S. House races has been in decline since at least the 1960s.[5]
^Nice, David (1984). "Competitiveness in house and senate elections with identical constituencies". Political Behavior. 6 (1): 95–102.
doi:
10.1007/BF00988231.
S2CID154349012.