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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
80% |
Joni Ernst* (R) |
2,669 |
63.9% |
Theresa Greenfield (D) |
1,403 |
33.6% |
108 [+] |
2.6% |
4,180 |
12 |
0.25% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 74 (1.8%);
Suzanne Herzog (I) 28 (0.7%);
Other (Write-in) 6 (0.1%);
|
|
2018 |
G |
53% |
Kim Reynolds* (R) |
1,753 |
62.6% |
Fred Hubbell (D) |
1,000 |
35.7% |
48 [+] |
1.7% |
2,801 |
12 |
0.21% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 32 (1.1%);
Gary Siegwarth (Clean Water) 16 (0.6%);
|
|
2016 |
S3 |
63% |
Charles Grassley* (R) |
2,330 |
69.6% |
Patty Judge (D) |
860 |
25.7% |
157 [+] |
4.7% |
3,347 |
10 |
0.22% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 94 (2.8%);
Other (Write-in) 63 (1.9%);
|
|
2014 |
S2 |
45% |
Joni Ernst (R) |
1,513 |
62.3% |
Bruce Braley (D) |
833 |
34.3% |
84 [+] |
3.5% |
2,430 |
10 |
0.22% |
| [-] Other candidates in 2014:
Rick Stewart (I) 45 (1.9%);
Bob Quast (I) 14 (0.6%);
Douglas Butzier (Libertarian) 13 (0.5%);
Ruth Smith (I) 11 (0.5%);
Other (Write-in) 1 (0.0%);
|
|
2014 |
G |
45% |
Terry Branstad* (R) |
1,668 |
68.1% |
Jack Hatch (D) |
712 |
29.1% |
69 [+] |
2.8% |
2,449 |
9 |
0.22% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 27 (1.1%);
Jonathan Narcisse (Iowa) 22 (0.9%);
Jim Hennager (New Independent) 20 (0.8%);
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
342 from 2010
)
512.5% 
55.9%