2018 Delaware U.S. Senate Election

Delaware · 4 candidates · See every 2018 U.S. Senate race

Who won the 2018 Delaware U.S. Senate Election?

Thomas R. Carper won the 2018 Delaware U.S. Senate Election. Thomas R. Carper received 217,385 popular votes (59.95%). The main challenger was Robert B Arlett (37.82%).

See the full head-to-head between Carper and Arlett

Carper +22.1 pts · won by 80,258 votes

Thomas R. Carper DemocraticWINNER59.95%

217,385 votes

Robert B Arlett Republican37.82%

137,127 votes

Demitri G TheodoropoulosGreen1.15%

4,170 votes

Nadine M. FrostLibertarian1.08%

3,910 votes

Popular-vote totals for U.S. Senate elections come from the MIT Election Data and Science Lab (1976–2024).

Data last verified July 28, 2026.