2018Final results
2018 election for South Carolina's 3rd District
U.S. House · South Carolina
Jeff Duncan (R) won with 67.8% of the vote, defeating Mary Geren (D) by 36.8 points.
Jeff DuncanRepublican · winner
67.8%153,338
Mary GerenDemocrat
31.0%70,046
Dave MooreOther party
1.2%2,697
226,204 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
Money in this race
Each line compares the two campaigns on one scale.
Mary GerenJeff Duncan
$306.3K
Raised by the campaign
$893.7K
$308.1K
Spent by the campaign
$714.4K
-$1.8K
Cash on hand
$244.6K
Campaign money: FEC, through Dec 31, 2018.
Source: FEC campaign filingsUpdated Dec 31, 2018