Mike Mansfield
Democratic
Undefeated: 4-0 career record
US Senate
Electoral Grade
A
+34.5 pts
avg overperformance
Better than 88% of candidates4 graded races
Overperformance vs. state presidential baseline. Incumbents held to a higher bar: Senate/Gov −3 pts, House −2 pts.
4
Races
4-0
W-L (100%)
+26.2
Avg Margin
1952–1970
Career Span
Best: +52.4 (1958 Senate)Worst: 2.2 (1952 Senate)
Career Margin Trend4 races
Career Timeline
150,060
Candidate Votes
60.5%
Vote %
247,869
Total Votes
+21.1%
Margin
Electoral Performance
+33.1
Race Score
+30.1
vs. Natl. Baseline
D-9.0
State Pres.