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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
62% |
Theresa Greenfield (D) |
1,763 |
50.4% |
Joni Ernst* (R) |
1,598 |
45.7% |
136 [+] |
3.9% |
3,497 |
-6 |
0.21% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 89 (2.5%);
Suzanne Herzog (I) 44 (1.3%);
Other (Write-in) 3 (0.1%);
|
|
2018 |
G |
47% |
Fred Hubbell (D) |
1,390 |
51.3% |
Kim Reynolds* (R) |
1,268 |
46.8% |
54 [+] |
2.0% |
2,712 |
-4 |
0.20% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 34 (1.3%);
Gary Siegwarth (Clean Water) 18 (0.7%);
Other (Write-in) 2 (0.1%);
|
|
2016 |
S3 |
61% |
Charles Grassley* (R) |
1,967 |
55.8% |
Patty Judge (D) |
1,435 |
40.7% |
120 [+] |
3.4% |
3,522 |
-4 |
0.23% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 77 (2.2%);
Other (Write-in) 43 (1.2%);
|
|
2014 |
S2 |
46% |
Bruce Braley (D) |
1,482 |
55.2% |
Joni Ernst (R) |
1,071 |
39.9% |
132 [+] |
4.9% |
2,685 |
-12 |
0.24% |
| [-] Other candidates in 2014:
Rick Stewart (I) 86 (3.2%);
Ruth Smith (I) 21 (0.8%);
Douglas Butzier (Libertarian) 12 (0.4%);
Bob Quast (I) 12 (0.4%);
Other (Write-in) 1 (0.0%);
|
|
2014 |
G |
46% |
Terry Branstad* (R) |
1,579 |
58.6% |
Jack Hatch (D) |
1,038 |
38.5% |
77 [+] |
2.9% |
2,694 |
0 |
0.24% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 33 (1.2%);
Jim Hennager (New Independent) 28 (1.0%);
Jonathan Narcisse (Iowa) 14 (0.5%);
Other (Write-in) 2 (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
288 from 2010
)
21.4% 
70.8%