| Incumbent Re-Election % | Incumbent "Landslide"% (over 60%) |
% of Seats Changing Party | Democratic Party Vote % > Seat % | |
|---|---|---|---|---|
| 1996 | 94.5 | 67.8* | 7.8 | 49 > 48 |
| 1994 | 91.1 | 66.8* | 13.8 | 45.4 > 46.9 |
| 1992 | 93.1 | 64.9* | 11.3 | 50.8 > 59.3 |
| 1990 | 96.3 | 79.5 | 4.8 | 52.9 > 61.4 |
| 1988 | 98.3 | 87.3 | 2.1 | 53.3 > 59.8 |
| 1986 | 98.5 | 84.5 | 4.8 | 54.5 > 59.3 |
| 1984 | 96.1 | 78.9 | 5.1 | 52.1 > 58.2 |
| 1982 | 92.4 | 68.9 | 7.1 | 55.6 > 61.8 |
| 1980 | 90.7 | 72.9 | 9.4 | 50.4 > 55.9 |
| 1978 | 95.0 | 76.6 | 7.6 | 53.4 > 63.7 |
| 1976 | 96.6 | 69.2 | 5.1 | 56.2 > 67.1 |
| 1974 | 89.6 | 66.4 | 12.6 | 57.6 > 66.9 |
| 1972 | 95.6 | 77.8 | 5.3 | 51.7 > 55.9 |
| 1970 | 96.9 | 77.3 | 5.7 | 53.4 > 58.6 |
| 1968 | 98.8 | 72.2 | 2.5 | 50.2 > 55.9 |
| 1966 | 90.1 | 67.7 | 10.8 | 50.9 > 57.0 |
| 1964 | 88.4 | 58.5 | 13.1 | 57.4 > 67.8 |
| 1962 | 94.3 | 63.6 | 4.4 | 52.3 > 59.3 |
| 1960 | 93.5 | 58.9 | 8.6 | 54.2 > 60.2 |
| 1958 | 90.6 | - | 11.4 | 56.3 > 64.8 |
| 1956 | 96.0 | - | 4.6 | 51.1 > 53.8 |
| 1954 | 94.5 | - | 6.0 | 52.5 > 53.3 |
* Based on 20% victory margins rather than winning 60% of the vote.
The Center for Voting and Democracy,
P.O. Box 60037, Washington, DC 20039