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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
70% |
Joni Ernst* (R) |
3,306 |
60.0% |
Theresa Greenfield (D) |
2,036 |
36.9% |
172 [+] |
3.1% |
5,514 |
8 |
0.33% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 112 (2.0%);
Suzanne Herzog (I) 53 (1.0%);
Other (Write-in) 7 (0.1%);
|
|
2018 |
G |
33% |
Kim Reynolds* (R) |
1,708 |
65.5% |
Fred Hubbell (D) |
855 |
32.8% |
45 [+] |
1.7% |
2,608 |
15 |
0.20% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 30 (1.2%);
Gary Siegwarth (Clean Water) 14 (0.5%);
Other (Write-in) 1 (0.0%);
|
|
2016 |
S3 |
67% |
Charles Grassley* (R) |
3,502 |
67.0% |
Patty Judge (D) |
1,532 |
29.3% |
196 [+] |
3.7% |
5,230 |
7 |
0.34% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 133 (2.5%);
Other (Write-in) 63 (1.2%);
|
|
2014 |
S2 |
52% |
Joni Ernst (R) |
2,208 |
54.9% |
Bruce Braley (D) |
1,613 |
40.1% |
204 [+] |
5.1% |
4,025 |
3 |
0.36% |
| [-] Other candidates in 2014:
Rick Stewart (I) 137 (3.4%);
Ruth Smith (I) 23 (0.6%);
Douglas Butzier (Libertarian) 22 (0.5%);
Bob Quast (I) 18 (0.4%);
Other (Write-in) 4 (0.1%);
|
|
2014 |
G |
53% |
Terry Branstad* (R) |
2,568 |
62.9% |
Jack Hatch (D) |
1,372 |
33.6% |
145 [+] |
3.5% |
4,085 |
4 |
0.36% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 90 (2.2%);
Jim Hennager (New Independent) 26 (0.6%);
Jonathan Narcisse (Iowa) 25 (0.6%);
Other (Write-in) 4 (0.1%);
|
*: 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
167 from 2010
)
1.5% 
64.1%