2018Final results
2018 election for South Dakota Legislative District 31
South Dakota State Senate · South Dakota
Bob Ewing (R) won with 65.2% of the vote, defeating Sherry Bea Smith (D) by 30.5 points.
Bob EwingRepublican · winner · incumbent
65.2%6,962
Sherry Bea SmithDemocrat
34.8%3,710
10,672 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