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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
49% |
Joni Ernst* (R) |
1,949 |
54.4% |
Theresa Greenfield (D) |
1,474 |
41.1% |
161 [+] |
4.5% |
3,584 |
3 |
0.21% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 106 (3.0%);
Suzanne Herzog (I) 46 (1.3%);
Other (Write-in) 9 (0.3%);
|
|
2018 |
G |
38% |
Kim Reynolds* (R) |
1,477 |
53.5% |
Fred Hubbell (D) |
1,228 |
44.5% |
57 [+] |
2.1% |
2,762 |
3 |
0.21% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 40 (1.4%);
Gary Siegwarth (Clean Water) 17 (0.6%);
|
|
2016 |
S3 |
49% |
Charles Grassley* (R) |
2,201 |
63.4% |
Patty Judge (D) |
1,122 |
32.3% |
147 [+] |
4.2% |
3,470 |
3 |
0.23% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 95 (2.7%);
Other (Write-in) 52 (1.5%);
|
|
2014 |
S2 |
36% |
Joni Ernst (R) |
1,432 |
57.4% |
Bruce Braley (D) |
961 |
38.5% |
103 [+] |
4.1% |
2,496 |
5 |
0.22% |
| [-] Other candidates in 2014:
Rick Stewart (I) 58 (2.3%);
Douglas Butzier (Libertarian) 15 (0.6%);
Bob Quast (I) 15 (0.6%);
Ruth Smith (I) 13 (0.5%);
Other (Write-in) 2 (0.1%);
|
|
2014 |
G |
36% |
Terry Branstad* (R) |
1,601 |
63.7% |
Jack Hatch (D) |
842 |
33.5% |
70 [+] |
2.8% |
2,513 |
5 |
0.22% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 29 (1.2%);
Jonathan Narcisse (Iowa) 23 (0.9%);
Jim Hennager (New Independent) 17 (0.7%);
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
546 from 2010
)
22.2% 
26.0%