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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
50% |
Joni Ernst* (R) |
1,438 |
66.9% |
Theresa Greenfield (D) |
649 |
30.2% |
61 [+] |
2.8% |
2,148 |
15 |
0.13% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 41 (1.9%);
Suzanne Herzog (I) 20 (0.9%);
|
|
2018 |
G |
39% |
Kim Reynolds* (R) |
1,002 |
59.1% |
Fred Hubbell (D) |
658 |
38.8% |
36 [+] |
2.1% |
1,696 |
9 |
0.13% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 27 (1.6%);
Gary Siegwarth (Clean Water) 8 (0.5%);
Other (Write-in) 1 (0.1%);
|
|
2016 |
S3 |
47% |
Charles Grassley* (R) |
1,489 |
72.6% |
Patty Judge (D) |
492 |
24.0% |
71 [+] |
3.5% |
2,052 |
12 |
0.13% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 46 (2.2%);
Other (Write-in) 25 (1.2%);
|
|
2014 |
S2 |
34% |
Joni Ernst (R) |
1,010 |
68.5% |
Bruce Braley (D) |
427 |
28.9% |
38 [+] |
2.6% |
1,475 |
16 |
0.13% |
| [-] Other candidates in 2014:
Rick Stewart (I) 19 (1.3%);
Ruth Smith (I) 9 (0.6%);
Douglas Butzier (Libertarian) 6 (0.4%);
Bob Quast (I) 4 (0.3%);
Other (Write-in) 0 (0.0%);
|
|
2014 |
G |
34% |
Terry Branstad* (R) |
1,053 |
71.0% |
Jack Hatch (D) |
387 |
26.1% |
43 [+] |
2.9% |
1,483 |
12 |
0.13% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 30 (2.0%);
Jim Hennager (New Independent) 10 (0.7%);
Jonathan Narcisse (Iowa) 2 (0.1%);
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
201 from 2010
)
40.2% 
1.1%