KEY POINTS FROM THIS ARTICLE — For the entire period from 1972 to 2020 there is little partisan bias in the seat/vote relationship, but this overall pattern obscures substantial bias from decade to decade. — In the 1970s and 1980s there was a substantial bias favoring the Democrats; in the 1990s the relationship was a … Continue reading Seats/Votes Relationship in the U.S. House 1972-2020