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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
76% |
Joni Ernst* (R) |
2,998 |
49.1% |
Theresa Greenfield (D) |
2,970 |
48.6% |
144 [+] |
2.4% |
6,112 |
-3 |
0.37% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 111 (1.8%);
Suzanne Herzog (I) 31 (0.5%);
Other (Write-in) 2 (0.0%);
|
|
2018 |
G |
61% |
Fred Hubbell (D) |
2,485 |
50.8% |
Kim Reynolds* (R) |
2,299 |
47.0% |
107 [+] |
2.2% |
4,891 |
-3 |
0.37% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 82 (1.7%);
Gary Siegwarth (Clean Water) 24 (0.5%);
Other (Write-in) 1 (0.0%);
|
|
2016 |
S3 |
71% |
Charles Grassley* (R) |
3,302 |
58.7% |
Patty Judge (D) |
2,137 |
38.0% |
188 [+] |
3.3% |
5,627 |
-1 |
0.37% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 132 (2.3%);
Other (Write-in) 56 (1.0%);
|
|
2014 |
S2 |
53% |
Joni Ernst (R) |
2,060 |
49.4% |
Bruce Braley (D) |
1,970 |
47.3% |
136 [+] |
3.3% |
4,166 |
-3 |
0.37% |
| [-] Other candidates in 2014:
Rick Stewart (I) 74 (1.8%);
Douglas Butzier (Libertarian) 40 (1.0%);
Ruth Smith (I) 15 (0.4%);
Bob Quast (I) 6 (0.1%);
Other (Write-in) 1 (0.0%);
|
|
2014 |
G |
53% |
Terry Branstad* (R) |
2,339 |
56.2% |
Jack Hatch (D) |
1,709 |
41.1% |
115 [+] |
2.8% |
4,163 |
-3 |
0.37% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 57 (1.4%);
Jim Hennager (New Independent) 36 (0.9%);
Jonathan Narcisse (Iowa) 20 (0.5%);
Other (Write-in) 2 (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
525 from 2010
)
0.1% 
99.1%