2018Flipped from RepublicanFinal resultsIncumbent defeated
2018 election for Michigan Senate District 20
Michigan State Senate · Michigan
Sean McCann (D) won with 53.1% of the vote, defeating Margaret Obrien (R) by 10.8 points, a seat Republicans won last time.
Sean McCannDemocrat · winner
53.1%60,528
Margaret ObrienRepublican · incumbent
42.3%48,195
Lorence WenkeLibertarian
4.6%5,274
113,997 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