2018Final resultsIncumbent defeated
2018 election for Pennsylvania Senate District 12
Pennsylvania State Senate · Pennsylvania
Maria Collett (D) won with 52.7% of the vote, defeating Stewart Greenleaf Jr. (R) by 5.4 points.
Maria CollettDemocrat · winner
52.7%62,069
Stewart Greenleaf Jr.Republican · incumbent
47.3%55,742
117,811 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET