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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
62% |
Joni Ernst* (R) |
3,318 |
61.3% |
Theresa Greenfield (D) |
1,842 |
34.0% |
253 [+] |
4.7% |
5,413 |
10 |
0.32% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 172 (3.2%);
Suzanne Herzog (I) 75 (1.4%);
Other (Write-in) 6 (0.1%);
|
|
2018 |
G |
46% |
Kim Reynolds* (R) |
2,440 |
61.2% |
Fred Hubbell (D) |
1,450 |
36.3% |
100 [+] |
2.5% |
3,990 |
11 |
0.30% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 75 (1.9%);
Gary Siegwarth (Clean Water) 24 (0.6%);
Other (Write-in) 1 (0.0%);
|
|
2016 |
S3 |
59% |
Charles Grassley* (R) |
3,512 |
68.5% |
Patty Judge (D) |
1,391 |
27.1% |
223 [+] |
4.4% |
5,126 |
8 |
0.33% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 159 (3.1%);
Other (Write-in) 64 (1.2%);
|
|
2014 |
S2 |
17% |
Joni Ernst (R) |
903 |
59.5% |
Bruce Braley (D) |
522 |
34.4% |
92 [+] |
6.1% |
1,517 |
7 |
0.13% |
| [-] Other candidates in 2014:
Rick Stewart (I) 49 (3.2%);
Ruth Smith (I) 16 (1.1%);
Douglas Butzier (Libertarian) 15 (1.0%);
Bob Quast (I) 9 (0.6%);
Other (Write-in) 3 (0.2%);
|
|
2014 |
G |
17% |
Terry Branstad* (R) |
1,014 |
66.7% |
Jack Hatch (D) |
437 |
28.7% |
70 [+] |
4.6% |
1,521 |
8 |
0.13% |
| [-] Other candidates in 2014:
Jonathan Narcisse (Iowa) 29 (1.9%);
Lee Hieb (Libertarian) 27 (1.8%);
Jim Hennager (New Independent) 14 (0.9%);
Other (Write-in) 0 (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
29 from 2010
)
1.1% 
16.6%