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| Year | Type | Turnout  | Winner | Runner-Up |
Other | Total Votes | Diff | PSV |
|---|
|
2020 |
S2 |
60% |
Joni Ernst* (R) |
1,889 |
52.5% |
Theresa Greenfield (D) |
1,580 |
43.9% |
132 [+] |
3.7% |
3,601 |
1 |
0.22% |
| [-] Other candidates in 2020:
Rick Stewart (Libertarian) 89 (2.5%);
Suzanne Herzog (I) 42 (1.2%);
Other (Write-in) 1 (0.0%);
|
|
2018 |
G |
48% |
Kim Reynolds* (R) |
1,436 |
49.8% |
Fred Hubbell (D) |
1,391 |
48.2% |
56 [+] |
1.9% |
2,883 |
0 |
0.22% |
| [-] Other candidates in 2018:
Jake Porter (Libertarian) 40 (1.4%);
Gary Siegwarth (Clean Water) 16 (0.6%);
|
|
2016 |
S3 |
59% |
Charles Grassley* (R) |
2,144 |
60.7% |
Patty Judge (D) |
1,242 |
35.2% |
145 [+] |
4.1% |
3,531 |
1 |
0.23% |
| [-] Other candidates in 2016:
Charles Aldrich (Libertarian) 93 (2.6%);
Other (Write-in) 52 (1.5%);
|
|
2014 |
S2 |
43% |
Joni Ernst (R) |
1,305 |
50.3% |
Bruce Braley (D) |
1,155 |
44.5% |
136 [+] |
5.2% |
2,596 |
-2 |
0.23% |
| [-] Other candidates in 2014:
Rick Stewart (I) 100 (3.9%);
Douglas Butzier (Libertarian) 13 (0.5%);
Ruth Smith (I) 12 (0.5%);
Bob Quast (I) 10 (0.4%);
Other (Write-in) 1 (0.0%);
|
|
2014 |
G |
43% |
Terry Branstad* (R) |
1,474 |
56.7% |
Jack Hatch (D) |
1,048 |
40.3% |
79 [+] |
3.0% |
2,601 |
-2 |
0.23% |
| [-] Other candidates in 2014:
Lee Hieb (Libertarian) 42 (1.6%);
Jonathan Narcisse (Iowa) 16 (0.6%);
Jim Hennager (New Independent) 16 (0.6%);
Other (Write-in) 5 (0.2%);
|
*: 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
283 from 2010
)
478.6% 
45.4%