1972Final resultsIncumbent defeated
1972 election for Pennsylvania Senate District 21
Pennsylvania State Senate · Pennsylvania
W. Thomas Andrews (R) won with 54.9% of the vote, defeating Donald O. Oesterling (D) by 9.8 points.
W. Thomas AndrewsRepublican · winner
54.9%47,712
Donald O. OesterlingDemocrat · incumbent
45.1%39,215
86,941 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 1972
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET