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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
67% |
Joni Ernst* (R) |
3,556 |
61.2% |
Theresa Greenfield (D) |
2,056 |
35.4% |
194 [+] |
3.3% |
5,806 |
10 |
0.35% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 132 (2.3%);
Suzanne Herzog (I) 54 (0.9%);
Other (Write-in) 8 (0.1%);
|
|
2018 |
G |
52% |
Kim Reynolds* (R) |
2,720 |
60.4% |
Fred Hubbell (D) |
1,700 |
37.7% |
86 [+] |
1.9% |
4,506 |
10 |
0.34% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 60 (1.3%);
Gary Siegwarth (Clean Water) 25 (0.6%);
Other (Write-in) 1 (0.0%);
|
|
2016 |
S3 |
63% |
Charles Grassley* (R) |
3,936 |
71.8% |
Patty Judge (D) |
1,354 |
24.7% |
191 [+] |
3.5% |
5,481 |
12 |
0.36% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 141 (2.6%);
Other (Write-in) 50 (0.9%);
|
|
2014 |
S2 |
45% |
Joni Ernst (R) |
2,412 |
61.5% |
Bruce Braley (D) |
1,337 |
34.1% |
176 [+] |
4.5% |
3,925 |
9 |
0.35% |
| [-] Other candidates in 2014:
Rick Stewart (I) 120 (3.1%);
Douglas Butzier (Libertarian) 19 (0.5%);
Bob Quast (I) 19 (0.5%);
Ruth Smith (I) 14 (0.4%);
Other (Write-in) 4 (0.1%);
|
|
2014 |
G |
46% |
Terry Branstad* (R) |
2,797 |
70.7% |
Jack Hatch (D) |
1,046 |
26.4% |
112 [+] |
2.8% |
3,955 |
12 |
0.35% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 44 (1.1%);
Jim Hennager (New Independent) 37 (0.9%);
Jonathan Narcisse (Iowa) 27 (0.7%);
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
118 from 2010
)
2.2% 
53.6%