2018Flipped from RepublicanFinal resultsIncumbent defeated
2018 election for Michigan Senate District 13
Michigan State Senate · Michigan
Mallory McMorrow (D) won with 51.9% of the vote, defeating Marty Knollenberg (R) by 3.8 points, a seat Republicans won last time.
Mallory McMorrowDemocrat · winner
51.9%73,146
Marty KnollenbergRepublican · incumbent
48.1%67,798
140,944 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