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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
62% |
Joni Ernst* (R) |
1,975 |
77.6% |
Theresa Greenfield (D) |
521 |
20.5% |
48 [+] |
1.9% |
2,544 |
26 |
0.15% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 34 (1.3%);
Suzanne Herzog (I) 14 (0.6%);
|
|
2018 |
G |
49% |
Kim Reynolds* (R) |
1,578 |
78.6% |
Fred Hubbell (D) |
397 |
19.8% |
33 [+] |
1.6% |
2,008 |
28 |
0.15% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 25 (1.2%);
Gary Siegwarth (Clean Water) 8 (0.4%);
|
|
2016 |
S3 |
61% |
Charles Grassley* (R) |
2,101 |
84.3% |
Patty Judge (D) |
333 |
13.4% |
57 [+] |
2.3% |
2,491 |
24 |
0.16% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 35 (1.4%);
Other (Write-in) 22 (0.9%);
|
|
2014 |
S2 |
46% |
Joni Ernst (R) |
1,493 |
80.7% |
Bruce Braley (D) |
315 |
17.0% |
42 [+] |
2.3% |
1,850 |
29 |
0.16% |
| [-] Other candidates in 2014:
Rick Stewart (I) 29 (1.6%);
Ruth Smith (I) 5 (0.3%);
Douglas Butzier (Libertarian) 4 (0.2%);
Bob Quast (I) 3 (0.2%);
Other (Write-in) 1 (0.1%);
|
|
2014 |
G |
46% |
Terry Branstad* (R) |
1,592 |
85.7% |
Jack Hatch (D) |
238 |
12.8% |
27 [+] |
1.5% |
1,857 |
27 |
0.16% |
| [-] Other candidates in 2014:
Jim Hennager (New Independent) 12 (0.6%);
Lee Hieb (Libertarian) 8 (0.4%);
Jonathan Narcisse (Iowa) 6 (0.3%);
Other (Write-in) 1 (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
229 from 2010
)
4.5% 
98.4%