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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
67% |
Joni Ernst* (R) |
1,408 |
55.5% |
Theresa Greenfield (D) |
1,037 |
40.8% |
94 [+] |
3.7% |
2,539 |
4 |
0.15% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 70 (2.8%);
Suzanne Herzog (I) 22 (0.9%);
Other (Write-in) 2 (0.1%);
|
|
2018 |
G |
54% |
Kim Reynolds* (R) |
1,109 |
54.0% |
Fred Hubbell (D) |
893 |
43.5% |
50 [+] |
2.4% |
2,052 |
4 |
0.15% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 39 (1.9%);
Gary Siegwarth (Clean Water) 11 (0.5%);
|
|
2016 |
S3 |
62% |
Charles Grassley* (R) |
1,578 |
65.7% |
Patty Judge (D) |
735 |
30.6% |
90 [+] |
3.7% |
2,403 |
6 |
0.16% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 59 (2.5%);
Other (Write-in) 31 (1.3%);
|
|
2014 |
S2 |
47% |
Joni Ernst (R) |
949 |
51.4% |
Bruce Braley (D) |
819 |
44.4% |
77 [+] |
4.2% |
1,845 |
-1 |
0.16% |
| [-] Other candidates in 2014:
Rick Stewart (I) 52 (2.8%);
Ruth Smith (I) 9 (0.5%);
Bob Quast (I) 7 (0.4%);
Douglas Butzier (Libertarian) 5 (0.3%);
Other (Write-in) 4 (0.2%);
|
|
2014 |
G |
48% |
Terry Branstad* (R) |
1,087 |
58.4% |
Jack Hatch (D) |
696 |
37.4% |
78 [+] |
4.2% |
1,861 |
-1 |
0.16% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 41 (2.2%);
Jim Hennager (New Independent) 19 (1.0%);
Jonathan Narcisse (Iowa) 18 (1.0%);
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
304 from 2010
)
293.3% 
165.8%