1990Final results
1990 election for Massachusetts House District 31
Massachusetts House of Representatives · Massachusetts
Douglas W. Petersen (D) won with 49.0% of the vote, defeating Monica S. Staaf (R) by 3.5 points.
Douglas W. PetersenDemocrat · winner
49.0%8,962
Monica S. StaafRepublican
45.5%8,323
Don RousseauIndependent
5.5%1,004
18,289 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 1990
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET