In the 2021 general election, an average of 85.54% of incumbents nationwide won their re-election bids. The number drops to 82.35% when including incumbents that withdrew or were disqualified.
In 2020, 93% of incumbents won their elections. In 2019, that number was 90%, and it was 92% in 2018.
Minnesota incumbents were the least successful in 2021 with a win rate of 55%, followed by Kansas (59%) and Colorado (67%).