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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
93% |
Joni Ernst* (R) |
2,203 |
52.8% |
Theresa Greenfield (D) |
1,837 |
44.0% |
133 [+] |
3.2% |
4,173 |
1 |
0.25% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 94 (2.3%);
Suzanne Herzog (I) 38 (0.9%);
Other (Write-in) 1 (0.0%);
|
|
2018 |
G |
74% |
Fred Hubbell (D) |
1,673 |
50.1% |
Kim Reynolds* (R) |
1,585 |
47.4% |
83 [+] |
2.5% |
3,341 |
-3 |
0.25% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 64 (1.9%);
Gary Siegwarth (Clean Water) 18 (0.5%);
Other (Write-in) 1 (0.0%);
|
|
2016 |
S3 |
86% |
Charles Grassley* (R) |
2,353 |
60.9% |
Patty Judge (D) |
1,340 |
34.7% |
169 [+] |
4.4% |
3,862 |
1 |
0.25% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 111 (2.9%);
Other (Write-in) 58 (1.5%);
|
|
2014 |
S2 |
69% |
Joni Ernst (R) |
1,496 |
47.8% |
Bruce Braley (D) |
1,481 |
47.3% |
151 [+] |
4.8% |
3,128 |
-4 |
0.28% |
| [-] Other candidates in 2014:
Rick Stewart (I) 82 (2.6%);
Bob Quast (I) 26 (0.8%);
Douglas Butzier (Libertarian) 22 (0.7%);
Ruth Smith (I) 18 (0.6%);
Other (Write-in) 3 (0.1%);
|
|
2014 |
G |
69% |
Terry Branstad* (R) |
1,788 |
57.2% |
Jack Hatch (D) |
1,238 |
39.6% |
102 [+] |
3.3% |
3,128 |
-2 |
0.28% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 45 (1.4%);
Jim Hennager (New Independent) 30 (1.0%);
Jonathan Narcisse (Iowa) 26 (0.8%);
Other (Write-in) 1 (0.0%);
|
*: incumbent +: ran on additional party lines Type: G: Governor; S1,S2,S3: Senate Class 1, 2 or 3
italics: special election RO: runoff election PSV: percent of state vote
140 from 2010
)
3.8% 
192.5%