Senate Elections 2020 | US Senate Elections | Iowa Races
2020 Iowa U.S. Senate Election Results
Joni Ernst
Percent: 51.74%
Votes: 864,997
Theresa Greenfield
Percent: 45.15%
Votes: 754,859
Race Summary
In the Iowa U.S. Senate election on November 3, 2020, incumbent Republican Joni Ernst won re-election for a second term, receiving 51.74% of the votes compared to Democratic challenger Theresa Greenfield's 45.12%. This election was one of the most competitive and costly in the nation, with significant financial backing from both parties as Democrats sought to flip the seat and gain Senate control. Despite polls showing a close contest and criticism of her debate performance, Ernst achieved a clear victory, benefiting from strong support in rural communities.
Full Results
Joni Ernst (REP)
Percent: 51.74%
Votes: 864,997
Theresa Greenfield (DEM)
Percent: 45.15%
Votes: 754,859
Rick Stewart (LIB)
Percent: 2.21%
Votes: 36,961
Suzanne Herzog (IND)
Percent: 0.83%
Votes: 13,800
Write-In
Percent: 0.07%
Votes: 1,211
Total votes: 1,671,828
State Map
Results by County
Adair County
Joni Ernst (REP)
Percent: 67.78%
Votes: 2,809
Theresa Greenfield (DEM)
Percent: 29.13%
Votes: 1,207
Rick Stewart (LIB)
Percent: 2.15%
Votes: 89
Suzanne Herzog (IND)
Percent: 0.87%
Votes: 36
Write-In
Percent: 0.07%
Votes: 3
Total votes: 4,144
Audubon County
Joni Ernst (REP)
Percent: 64.89%
Votes: 2,188
Theresa Greenfield (DEM)
Percent: 32.38%
Votes: 1,092
Rick Stewart (LIB)
Percent: 2.08%
Votes: 70
Suzanne Herzog (IND)
Percent: 0.62%
Votes: 21
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,372
Bremer County
Joni Ernst (REP)
Percent: 56.72%
Votes: 8,196
Theresa Greenfield (DEM)
Percent: 40.91%
Votes: 5,911
Rick Stewart (LIB)
Percent: 1.76%
Votes: 254
Suzanne Herzog (IND)
Percent: 0.58%
Votes: 84
Write-In
Percent: 0.03%
Votes: 5
Total votes: 14,450
Calhoun County
Joni Ernst (REP)
Percent: 67.40%
Votes: 3,513
Theresa Greenfield (DEM)
Percent: 29.37%
Votes: 1,531
Rick Stewart (LIB)
Percent: 2.48%
Votes: 129
Suzanne Herzog (IND)
Percent: 0.61%
Votes: 32
Write-In
Percent: 0.13%
Votes: 7
Total votes: 5,212
Cerro Gordo County
Joni Ernst (REP)
Percent: 48.19%
Votes: 11,339
Theresa Greenfield (DEM)
Percent: 49.02%
Votes: 11,534
Rick Stewart (LIB)
Percent: 1.83%
Votes: 430
Suzanne Herzog (IND)
Percent: 0.90%
Votes: 211
Write-In
Percent: 0.07%
Votes: 16
Total votes: 23,530
Clay County
Joni Ernst (REP)
Percent: 64.46%
Votes: 5,716
Theresa Greenfield (DEM)
Percent: 32.26%
Votes: 2,861
Rick Stewart (LIB)
Percent: 2.18%
Votes: 193
Suzanne Herzog (IND)
Percent: 1.00%
Votes: 89
Write-In
Percent: 0.10%
Votes: 9
Total votes: 8,868
Dallas County
Joni Ernst (REP)
Percent: 51.69%
Votes: 28,727
Theresa Greenfield (DEM)
Percent: 45.75%
Votes: 25,427
Rick Stewart (LIB)
Percent: 1.81%
Votes: 1,006
Suzanne Herzog (IND)
Percent: 0.69%
Votes: 381
Write-In
Percent: 0.06%
Votes: 33
Total votes: 55,574
Des Moines County
Joni Ernst (REP)
Percent: 48.27%
Votes: 9,468
Theresa Greenfield (DEM)
Percent: 47.39%
Votes: 9,296
Rick Stewart (LIB)
Percent: 3.01%
Votes: 591
Suzanne Herzog (IND)
Percent: 1.18%
Votes: 232
Write-In
Percent: 0.15%
Votes: 29
Total votes: 19,616
Fayette County
Joni Ernst (REP)
Percent: 58.06%
Votes: 5,865
Theresa Greenfield (DEM)
Percent: 38.73%
Votes: 3,912
Rick Stewart (LIB)
Percent: 2.27%
Votes: 229
Suzanne Herzog (IND)
Percent: 0.88%
Votes: 89
Write-In
Percent: 0.07%
Votes: 7
Total votes: 10,102
Greene County
Joni Ernst (REP)
Percent: 61.36%
Votes: 3,063
Theresa Greenfield (DEM)
Percent: 35.74%
Votes: 1,784
Rick Stewart (LIB)
Percent: 2.08%
Votes: 104
Suzanne Herzog (IND)
Percent: 0.78%
Votes: 39
Write-In
Percent: 0.04%
Votes: 2
Total votes: 4,992
Hancock County
Joni Ernst (REP)
Percent: 65.86%
Votes: 4,004
Theresa Greenfield (DEM)
Percent: 30.94%
Votes: 1,881
Rick Stewart (LIB)
Percent: 2.14%
Votes: 130
Suzanne Herzog (IND)
Percent: 0.99%
Votes: 60
Write-In
Percent: 0.08%
Votes: 5
Total votes: 6,080
Howard County
Joni Ernst (REP)
Percent: 55.36%
Votes: 2,716
Theresa Greenfield (DEM)
Percent: 41.05%
Votes: 2,014
Rick Stewart (LIB)
Percent: 2.41%
Votes: 118
Suzanne Herzog (IND)
Percent: 1.18%
Votes: 58
Write-In
Percent: 0.00%
Votes: 0
Total votes: 4,906
Jackson County
Joni Ernst (REP)
Percent: 56.58%
Votes: 6,175
Theresa Greenfield (DEM)
Percent: 38.94%
Votes: 4,249
Rick Stewart (LIB)
Percent: 3.35%
Votes: 366
Suzanne Herzog (IND)
Percent: 1.08%
Votes: 118
Write-In
Percent: 0.05%
Votes: 5
Total votes: 10,913
Jones County
Joni Ernst (REP)
Percent: 57.97%
Votes: 6,320
Theresa Greenfield (DEM)
Percent: 38.86%
Votes: 4,237
Rick Stewart (LIB)
Percent: 2.50%
Votes: 273
Suzanne Herzog (IND)
Percent: 0.62%
Votes: 68
Write-In
Percent: 0.04%
Votes: 4
Total votes: 10,902
Linn County
Joni Ernst (REP)
Percent: 42.10%
Votes: 53,248
Theresa Greenfield (DEM)
Percent: 54.66%
Votes: 69,125
Rick Stewart (LIB)
Percent: 2.52%
Votes: 3,188
Suzanne Herzog (IND)
Percent: 0.64%
Votes: 815
Write-In
Percent: 0.07%
Votes: 90
Total votes: 126,466
Madison County
Joni Ernst (REP)
Percent: 64.25%
Votes: 6,245
Theresa Greenfield (DEM)
Percent: 32.59%
Votes: 3,168
Rick Stewart (LIB)
Percent: 2.24%
Votes: 218
Suzanne Herzog (IND)
Percent: 0.88%
Votes: 86
Write-In
Percent: 0.03%
Votes: 3
Total votes: 9,720
Mills County
Joni Ernst (REP)
Percent: 65.54%
Votes: 5,347
Theresa Greenfield (DEM)
Percent: 31.18%
Votes: 2,544
Rick Stewart (LIB)
Percent: 2.17%
Votes: 177
Suzanne Herzog (IND)
Percent: 1.01%
Votes: 82
Write-In
Percent: 0.10%
Votes: 8
Total votes: 8,158
Montgomery County
Joni Ernst (REP)
Percent: 68.53%
Votes: 3,633
Theresa Greenfield (DEM)
Percent: 28.67%
Votes: 1,520
Rick Stewart (LIB)
Percent: 1.85%
Votes: 98
Suzanne Herzog (IND)
Percent: 0.87%
Votes: 46
Write-In
Percent: 0.08%
Votes: 4
Total votes: 5,301
Page County
Joni Ernst (REP)
Percent: 69.27%
Votes: 5,152
Theresa Greenfield (DEM)
Percent: 27.79%
Votes: 2,067
Rick Stewart (LIB)
Percent: 1.86%
Votes: 138
Suzanne Herzog (IND)
Percent: 1.05%
Votes: 78
Write-In
Percent: 0.04%
Votes: 3
Total votes: 7,438
Polk County
Joni Ernst (REP)
Percent: 41.54%
Votes: 106,443
Theresa Greenfield (DEM)
Percent: 55.54%
Votes: 142,328
Rick Stewart (LIB)
Percent: 2.07%
Votes: 5,313
Suzanne Herzog (IND)
Percent: 0.77%
Votes: 1,985
Write-In
Percent: 0.07%
Votes: 188
Total votes: 256,257
Sac County
Joni Ernst (REP)
Percent: 70.17%
Votes: 3,849
Theresa Greenfield (DEM)
Percent: 26.25%
Votes: 1,440
Rick Stewart (LIB)
Percent: 2.35%
Votes: 129
Suzanne Herzog (IND)
Percent: 1.09%
Votes: 60
Write-In
Percent: 0.13%
Votes: 7
Total votes: 5,485
Story County
Joni Ernst (REP)
Percent: 41.08%
Votes: 20,750
Theresa Greenfield (DEM)
Percent: 55.86%
Votes: 28,216
Rick Stewart (LIB)
Percent: 2.24%
Votes: 1,133
Suzanne Herzog (IND)
Percent: 0.73%
Votes: 370
Write-In
Percent: 0.09%
Votes: 44
Total votes: 50,513
Van Buren County
Joni Ernst (REP)
Percent: 68.84%
Votes: 2,583
Theresa Greenfield (DEM)
Percent: 28.38%
Votes: 1,065
Rick Stewart (LIB)
Percent: 2.00%
Votes: 75
Suzanne Herzog (IND)
Percent: 0.75%
Votes: 28
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,752
Wayne County
Joni Ernst (REP)
Percent: 71.55%
Votes: 2,186
Theresa Greenfield (DEM)
Percent: 25.66%
Votes: 784
Rick Stewart (LIB)
Percent: 1.73%
Votes: 53
Suzanne Herzog (IND)
Percent: 0.92%
Votes: 28
Write-In
Percent: 0.13%
Votes: 4
Total votes: 3,055
Woodbury County
Joni Ernst (REP)
Percent: 54.27%
Votes: 24,175
Theresa Greenfield (DEM)
Percent: 41.92%
Votes: 18,674
Rick Stewart (LIB)
Percent: 2.23%
Votes: 994
Suzanne Herzog (IND)
Percent: 1.41%
Votes: 629
Write-In
Percent: 0.16%
Votes: 72
Total votes: 44,544
Adams County
Joni Ernst (REP)
Percent: 69.34%
Votes: 1,497
Theresa Greenfield (DEM)
Percent: 27.51%
Votes: 594
Rick Stewart (LIB)
Percent: 2.13%
Votes: 46
Suzanne Herzog (IND)
Percent: 0.88%
Votes: 19
Write-In
Percent: 0.14%
Votes: 3
Total votes: 2,159
Benton County
Joni Ernst (REP)
Percent: 60.93%
Votes: 8,830
Theresa Greenfield (DEM)
Percent: 35.90%
Votes: 5,202
Rick Stewart (LIB)
Percent: 2.28%
Votes: 331
Suzanne Herzog (IND)
Percent: 0.83%
Votes: 120
Write-In
Percent: 0.06%
Votes: 9
Total votes: 14,492
Buchanan County
Joni Ernst (REP)
Percent: 56.64%
Votes: 6,063
Theresa Greenfield (DEM)
Percent: 40.10%
Votes: 4,292
Rick Stewart (LIB)
Percent: 2.32%
Votes: 248
Suzanne Herzog (IND)
Percent: 0.90%
Votes: 96
Write-In
Percent: 0.05%
Votes: 5
Total votes: 10,704
Carroll County
Joni Ernst (REP)
Percent: 64.91%
Votes: 7,245
Theresa Greenfield (DEM)
Percent: 32.07%
Votes: 3,580
Rick Stewart (LIB)
Percent: 2.06%
Votes: 230
Suzanne Herzog (IND)
Percent: 0.86%
Votes: 96
Write-In
Percent: 0.10%
Votes: 11
Total votes: 11,162
Cherokee County
Joni Ernst (REP)
Percent: 65.59%
Votes: 4,214
Theresa Greenfield (DEM)
Percent: 31.16%
Votes: 2,002
Rick Stewart (LIB)
Percent: 2.15%
Votes: 138
Suzanne Herzog (IND)
Percent: 1.04%
Votes: 67
Write-In
Percent: 0.06%
Votes: 4
Total votes: 6,425
Clayton County
Joni Ernst (REP)
Percent: 61.37%
Votes: 5,845
Theresa Greenfield (DEM)
Percent: 36.06%
Votes: 3,434
Rick Stewart (LIB)
Percent: 1.65%
Votes: 157
Suzanne Herzog (IND)
Percent: 0.86%
Votes: 82
Write-In
Percent: 0.06%
Votes: 6
Total votes: 9,524
Davis County
Joni Ernst (REP)
Percent: 67.51%
Votes: 2,728
Theresa Greenfield (DEM)
Percent: 28.88%
Votes: 1,167
Rick Stewart (LIB)
Percent: 2.77%
Votes: 112
Suzanne Herzog (IND)
Percent: 0.79%
Votes: 32
Write-In
Percent: 0.05%
Votes: 2
Total votes: 4,041
Dickinson County
Joni Ernst (REP)
Percent: 63.92%
Votes: 7,149
Theresa Greenfield (DEM)
Percent: 33.90%
Votes: 3,791
Rick Stewart (LIB)
Percent: 1.56%
Votes: 174
Suzanne Herzog (IND)
Percent: 0.59%
Votes: 66
Write-In
Percent: 0.04%
Votes: 4
Total votes: 11,184
Floyd County
Joni Ernst (REP)
Percent: 52.45%
Votes: 4,181
Theresa Greenfield (DEM)
Percent: 43.88%
Votes: 3,498
Rick Stewart (LIB)
Percent: 2.35%
Votes: 187
Suzanne Herzog (IND)
Percent: 1.23%
Votes: 98
Write-In
Percent: 0.10%
Votes: 8
Total votes: 7,972
Grundy County
Joni Ernst (REP)
Percent: 67.90%
Votes: 4,900
Theresa Greenfield (DEM)
Percent: 29.38%
Votes: 2,120
Rick Stewart (LIB)
Percent: 2.13%
Votes: 154
Suzanne Herzog (IND)
Percent: 0.53%
Votes: 38
Write-In
Percent: 0.07%
Votes: 5
Total votes: 7,217
Hardin County
Joni Ernst (REP)
Percent: 63.80%
Votes: 5,639
Theresa Greenfield (DEM)
Percent: 33.04%
Votes: 2,920
Rick Stewart (LIB)
Percent: 2.21%
Votes: 195
Suzanne Herzog (IND)
Percent: 0.95%
Votes: 84
Write-In
Percent: 0.01%
Votes: 1
Total votes: 8,839
Humboldt County
Joni Ernst (REP)
Percent: 69.74%
Votes: 3,671
Theresa Greenfield (DEM)
Percent: 27.41%
Votes: 1,443
Rick Stewart (LIB)
Percent: 2.05%
Votes: 108
Suzanne Herzog (IND)
Percent: 0.76%
Votes: 40
Write-In
Percent: 0.04%
Votes: 2
Total votes: 5,264
Jasper County
Joni Ernst (REP)
Percent: 56.95%
Votes: 11,405
Theresa Greenfield (DEM)
Percent: 39.47%
Votes: 7,905
Rick Stewart (LIB)
Percent: 2.65%
Votes: 531
Suzanne Herzog (IND)
Percent: 0.83%
Votes: 167
Write-In
Percent: 0.09%
Votes: 18
Total votes: 20,026
Keokuk County
Joni Ernst (REP)
Percent: 68.39%
Votes: 3,565
Theresa Greenfield (DEM)
Percent: 28.56%
Votes: 1,489
Rick Stewart (LIB)
Percent: 1.94%
Votes: 101
Suzanne Herzog (IND)
Percent: 1.02%
Votes: 53
Write-In
Percent: 0.10%
Votes: 5
Total votes: 5,213
Louisa County
Joni Ernst (REP)
Percent: 61.97%
Votes: 3,259
Theresa Greenfield (DEM)
Percent: 34.30%
Votes: 1,804
Rick Stewart (LIB)
Percent: 2.68%
Votes: 141
Suzanne Herzog (IND)
Percent: 0.97%
Votes: 51
Write-In
Percent: 0.08%
Votes: 4
Total votes: 5,259
Mahaska County
Joni Ernst (REP)
Percent: 70.00%
Votes: 7,860
Theresa Greenfield (DEM)
Percent: 26.44%
Votes: 2,969
Rick Stewart (LIB)
Percent: 2.43%
Votes: 273
Suzanne Herzog (IND)
Percent: 1.05%
Votes: 118
Write-In
Percent: 0.07%
Votes: 8
Total votes: 11,228
Mitchell County
Joni Ernst (REP)
Percent: 57.69%
Votes: 3,347
Theresa Greenfield (DEM)
Percent: 39.33%
Votes: 2,282
Rick Stewart (LIB)
Percent: 2.14%
Votes: 124
Suzanne Herzog (IND)
Percent: 0.84%
Votes: 49
Write-In
Percent: 0.00%
Votes: 0
Total votes: 5,802
Muscatine County
Joni Ernst (REP)
Percent: 50.28%
Votes: 10,278
Theresa Greenfield (DEM)
Percent: 45.89%
Votes: 9,381
Rick Stewart (LIB)
Percent: 2.79%
Votes: 570
Suzanne Herzog (IND)
Percent: 0.97%
Votes: 199
Write-In
Percent: 0.06%
Votes: 13
Total votes: 20,441
Palo Alto County
Joni Ernst (REP)
Percent: 63.12%
Votes: 3,113
Theresa Greenfield (DEM)
Percent: 34.00%
Votes: 1,677
Rick Stewart (LIB)
Percent: 2.15%
Votes: 106
Suzanne Herzog (IND)
Percent: 0.73%
Votes: 36
Write-In
Percent: 0.00%
Votes: 0
Total votes: 4,932
Pottawattamie County
Joni Ernst (REP)
Percent: 54.85%
Votes: 24,720
Theresa Greenfield (DEM)
Percent: 41.10%
Votes: 18,520
Rick Stewart (LIB)
Percent: 2.82%
Votes: 1,269
Suzanne Herzog (IND)
Percent: 1.16%
Votes: 524
Write-In
Percent: 0.07%
Votes: 32
Total votes: 45,065
Scott County
Joni Ernst (REP)
Percent: 46.88%
Votes: 42,941
Theresa Greenfield (DEM)
Percent: 49.94%
Votes: 45,751
Rick Stewart (LIB)
Percent: 2.33%
Votes: 2,139
Suzanne Herzog (IND)
Percent: 0.77%
Votes: 709
Write-In
Percent: 0.07%
Votes: 66
Total votes: 91,606
Tama County
Joni Ernst (REP)
Percent: 56.74%
Votes: 5,090
Theresa Greenfield (DEM)
Percent: 40.00%
Votes: 3,588
Rick Stewart (LIB)
Percent: 2.29%
Votes: 205
Suzanne Herzog (IND)
Percent: 0.88%
Votes: 79
Write-In
Percent: 0.09%
Votes: 8
Total votes: 8,970
Wapello County
Joni Ernst (REP)
Percent: 55.15%
Votes: 8,464
Theresa Greenfield (DEM)
Percent: 41.33%
Votes: 6,344
Rick Stewart (LIB)
Percent: 2.57%
Votes: 394
Suzanne Herzog (IND)
Percent: 0.86%
Votes: 132
Write-In
Percent: 0.09%
Votes: 14
Total votes: 15,348
Webster County
Joni Ernst (REP)
Percent: 57.81%
Votes: 10,195
Theresa Greenfield (DEM)
Percent: 38.81%
Votes: 6,845
Rick Stewart (LIB)
Percent: 2.29%
Votes: 403
Suzanne Herzog (IND)
Percent: 0.98%
Votes: 173
Write-In
Percent: 0.11%
Votes: 19
Total votes: 17,635
Worth County
Joni Ernst (REP)
Percent: 55.40%
Votes: 2,425
Theresa Greenfield (DEM)
Percent: 41.19%
Votes: 1,803
Rick Stewart (LIB)
Percent: 2.24%
Votes: 98
Suzanne Herzog (IND)
Percent: 1.05%
Votes: 46
Write-In
Percent: 0.11%
Votes: 5
Total votes: 4,377
Allamakee County
Joni Ernst (REP)
Percent: 61.04%
Votes: 4,478
Theresa Greenfield (DEM)
Percent: 35.47%
Votes: 2,602
Rick Stewart (LIB)
Percent: 2.39%
Votes: 175
Suzanne Herzog (IND)
Percent: 1.09%
Votes: 80
Write-In
Percent: 0.01%
Votes: 1
Total votes: 7,336
Black Hawk County
Joni Ernst (REP)
Percent: 44.27%
Votes: 29,222
Theresa Greenfield (DEM)
Percent: 52.96%
Votes: 34,963
Rick Stewart (LIB)
Percent: 1.97%
Votes: 1,301
Suzanne Herzog (IND)
Percent: 0.74%
Votes: 490
Write-In
Percent: 0.06%
Votes: 37
Total votes: 66,013
Buena Vista County
Joni Ernst (REP)
Percent: 59.09%
Votes: 4,724
Theresa Greenfield (DEM)
Percent: 37.80%
Votes: 3,022
Rick Stewart (LIB)
Percent: 2.08%
Votes: 166
Suzanne Herzog (IND)
Percent: 0.94%
Votes: 75
Write-In
Percent: 0.09%
Votes: 7
Total votes: 7,994
Cass County
Joni Ernst (REP)
Percent: 65.95%
Votes: 4,725
Theresa Greenfield (DEM)
Percent: 31.53%
Votes: 2,259
Rick Stewart (LIB)
Percent: 1.67%
Votes: 120
Suzanne Herzog (IND)
Percent: 0.75%
Votes: 54
Write-In
Percent: 0.10%
Votes: 7
Total votes: 7,165
Chickasaw County
Joni Ernst (REP)
Percent: 61.16%
Votes: 4,024
Theresa Greenfield (DEM)
Percent: 35.32%
Votes: 2,324
Rick Stewart (LIB)
Percent: 2.42%
Votes: 159
Suzanne Herzog (IND)
Percent: 1.08%
Votes: 71
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,580
Clinton County
Joni Ernst (REP)
Percent: 51.57%
Votes: 12,559
Theresa Greenfield (DEM)
Percent: 44.93%
Votes: 10,942
Rick Stewart (LIB)
Percent: 2.61%
Votes: 635
Suzanne Herzog (IND)
Percent: 0.82%
Votes: 200
Write-In
Percent: 0.06%
Votes: 15
Total votes: 24,351
Decatur County
Joni Ernst (REP)
Percent: 65.21%
Votes: 2,439
Theresa Greenfield (DEM)
Percent: 31.15%
Votes: 1,165
Rick Stewart (LIB)
Percent: 2.41%
Votes: 90
Suzanne Herzog (IND)
Percent: 1.15%
Votes: 43
Write-In
Percent: 0.08%
Votes: 3
Total votes: 3,740
Dubuque County
Joni Ernst (REP)
Percent: 49.05%
Votes: 26,034
Theresa Greenfield (DEM)
Percent: 47.91%
Votes: 25,433
Rick Stewart (LIB)
Percent: 2.16%
Votes: 1,148
Suzanne Herzog (IND)
Percent: 0.81%
Votes: 428
Write-In
Percent: 0.07%
Votes: 37
Total votes: 53,080
Franklin County
Joni Ernst (REP)
Percent: 64.55%
Votes: 3,270
Theresa Greenfield (DEM)
Percent: 32.35%
Votes: 1,639
Rick Stewart (LIB)
Percent: 1.97%
Votes: 100
Suzanne Herzog (IND)
Percent: 0.99%
Votes: 50
Write-In
Percent: 0.14%
Votes: 7
Total votes: 5,066
Guthrie County
Joni Ernst (REP)
Percent: 64.86%
Votes: 4,103
Theresa Greenfield (DEM)
Percent: 31.62%
Votes: 2,000
Rick Stewart (LIB)
Percent: 2.56%
Votes: 162
Suzanne Herzog (IND)
Percent: 0.89%
Votes: 56
Write-In
Percent: 0.08%
Votes: 5
Total votes: 6,326
Harrison County
Joni Ernst (REP)
Percent: 63.10%
Votes: 5,059
Theresa Greenfield (DEM)
Percent: 32.10%
Votes: 2,574
Rick Stewart (LIB)
Percent: 3.16%
Votes: 253
Suzanne Herzog (IND)
Percent: 1.47%
Votes: 118
Write-In
Percent: 0.17%
Votes: 14
Total votes: 8,018
Ida County
Joni Ernst (REP)
Percent: 72.23%
Votes: 2,757
Theresa Greenfield (DEM)
Percent: 25.26%
Votes: 964
Rick Stewart (LIB)
Percent: 1.73%
Votes: 66
Suzanne Herzog (IND)
Percent: 0.73%
Votes: 28
Write-In
Percent: 0.05%
Votes: 2
Total votes: 3,817
Jefferson County
Joni Ernst (REP)
Percent: 45.50%
Votes: 4,008
Theresa Greenfield (DEM)
Percent: 51.62%
Votes: 4,547
Rick Stewart (LIB)
Percent: 1.85%
Votes: 163
Suzanne Herzog (IND)
Percent: 0.91%
Votes: 80
Write-In
Percent: 0.11%
Votes: 10
Total votes: 8,808
Kossuth County
Joni Ernst (REP)
Percent: 66.14%
Votes: 5,957
Theresa Greenfield (DEM)
Percent: 31.08%
Votes: 2,799
Rick Stewart (LIB)
Percent: 2.14%
Votes: 193
Suzanne Herzog (IND)
Percent: 0.63%
Votes: 57
Write-In
Percent: 0.00%
Votes: 0
Total votes: 9,006
Lucas County
Joni Ernst (REP)
Percent: 68.32%
Votes: 3,105
Theresa Greenfield (DEM)
Percent: 28.65%
Votes: 1,302
Rick Stewart (LIB)
Percent: 2.18%
Votes: 99
Suzanne Herzog (IND)
Percent: 0.79%
Votes: 36
Write-In
Percent: 0.07%
Votes: 3
Total votes: 4,545
Marion County
Joni Ernst (REP)
Percent: 64.06%
Votes: 12,211
Theresa Greenfield (DEM)
Percent: 32.89%
Votes: 6,269
Rick Stewart (LIB)
Percent: 2.22%
Votes: 423
Suzanne Herzog (IND)
Percent: 0.76%
Votes: 144
Write-In
Percent: 0.08%
Votes: 15
Total votes: 19,062
Monona County
Joni Ernst (REP)
Percent: 65.47%
Votes: 3,054
Theresa Greenfield (DEM)
Percent: 31.19%
Votes: 1,455
Rick Stewart (LIB)
Percent: 2.32%
Votes: 108
Suzanne Herzog (IND)
Percent: 0.84%
Votes: 39
Write-In
Percent: 0.19%
Votes: 9
Total votes: 4,665
O'Brien County
Joni Ernst (REP)
Percent: 76.05%
Votes: 5,675
Theresa Greenfield (DEM)
Percent: 21.98%
Votes: 1,640
Rick Stewart (LIB)
Percent: 1.41%
Votes: 105
Suzanne Herzog (IND)
Percent: 0.51%
Votes: 38
Write-In
Percent: 0.05%
Votes: 4
Total votes: 7,462
Plymouth County
Joni Ernst (REP)
Percent: 72.26%
Votes: 10,145
Theresa Greenfield (DEM)
Percent: 25.55%
Votes: 3,587
Rick Stewart (LIB)
Percent: 1.56%
Votes: 219
Suzanne Herzog (IND)
Percent: 0.55%
Votes: 77
Write-In
Percent: 0.08%
Votes: 11
Total votes: 14,039
Poweshiek County
Joni Ernst (REP)
Percent: 53.38%
Votes: 5,361
Theresa Greenfield (DEM)
Percent: 43.62%
Votes: 4,381
Rick Stewart (LIB)
Percent: 2.01%
Votes: 202
Suzanne Herzog (IND)
Percent: 0.91%
Votes: 91
Write-In
Percent: 0.08%
Votes: 8
Total votes: 10,043
Shelby County
Joni Ernst (REP)
Percent: 67.06%
Votes: 4,489
Theresa Greenfield (DEM)
Percent: 29.71%
Votes: 1,989
Rick Stewart (LIB)
Percent: 2.33%
Votes: 156
Suzanne Herzog (IND)
Percent: 0.85%
Votes: 57
Write-In
Percent: 0.04%
Votes: 3
Total votes: 6,694
Taylor County
Joni Ernst (REP)
Percent: 72.80%
Votes: 2,337
Theresa Greenfield (DEM)
Percent: 23.74%
Votes: 762
Rick Stewart (LIB)
Percent: 2.59%
Votes: 83
Suzanne Herzog (IND)
Percent: 0.87%
Votes: 28
Write-In
Percent: 0.00%
Votes: 0
Total votes: 3,210
Warren County
Joni Ernst (REP)
Percent: 56.27%
Votes: 17,276
Theresa Greenfield (DEM)
Percent: 40.64%
Votes: 12,478
Rick Stewart (LIB)
Percent: 2.25%
Votes: 692
Suzanne Herzog (IND)
Percent: 0.76%
Votes: 234
Write-In
Percent: 0.07%
Votes: 23
Total votes: 30,703
Winnebago County
Joni Ernst (REP)
Percent: 56.29%
Votes: 3,336
Theresa Greenfield (DEM)
Percent: 39.84%
Votes: 2,361
Rick Stewart (LIB)
Percent: 2.58%
Votes: 153
Suzanne Herzog (IND)
Percent: 1.21%
Votes: 72
Write-In
Percent: 0.07%
Votes: 4
Total votes: 5,926
Wright County
Joni Ernst (REP)
Percent: 62.85%
Votes: 3,889
Theresa Greenfield (DEM)
Percent: 33.34%
Votes: 2,063
Rick Stewart (LIB)
Percent: 2.55%
Votes: 158
Suzanne Herzog (IND)
Percent: 1.23%
Votes: 76
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,188
Appanoose County
Joni Ernst (REP)
Percent: 65.60%
Votes: 4,189
Theresa Greenfield (DEM)
Percent: 30.63%
Votes: 1,956
Rick Stewart (LIB)
Percent: 2.63%
Votes: 168
Suzanne Herzog (IND)
Percent: 1.11%
Votes: 71
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,386
Boone County
Joni Ernst (REP)
Percent: 54.74%
Votes: 8,315
Theresa Greenfield (DEM)
Percent: 41.58%
Votes: 6,316
Rick Stewart (LIB)
Percent: 2.53%
Votes: 385
Suzanne Herzog (IND)
Percent: 1.10%
Votes: 167
Write-In
Percent: 0.05%
Votes: 7
Total votes: 15,190
Butler County
Joni Ernst (REP)
Percent: 66.06%
Votes: 5,291
Theresa Greenfield (DEM)
Percent: 30.89%
Votes: 2,474
Rick Stewart (LIB)
Percent: 2.16%
Votes: 173
Suzanne Herzog (IND)
Percent: 0.86%
Votes: 69
Write-In
Percent: 0.02%
Votes: 2
Total votes: 8,009
Cedar County
Joni Ernst (REP)
Percent: 56.30%
Votes: 5,935
Theresa Greenfield (DEM)
Percent: 40.79%
Votes: 4,300
Rick Stewart (LIB)
Percent: 2.14%
Votes: 226
Suzanne Herzog (IND)
Percent: 0.70%
Votes: 74
Write-In
Percent: 0.06%
Votes: 6
Total votes: 10,541
Clarke County
Joni Ernst (REP)
Percent: 63.05%
Votes: 2,906
Theresa Greenfield (DEM)
Percent: 32.98%
Votes: 1,520
Rick Stewart (LIB)
Percent: 2.58%
Votes: 119
Suzanne Herzog (IND)
Percent: 1.30%
Votes: 60
Write-In
Percent: 0.09%
Votes: 4
Total votes: 4,609
Crawford County
Joni Ernst (REP)
Percent: 63.12%
Votes: 4,424
Theresa Greenfield (DEM)
Percent: 33.33%
Votes: 2,336
Rick Stewart (LIB)
Percent: 2.28%
Votes: 160
Suzanne Herzog (IND)
Percent: 1.14%
Votes: 80
Write-In
Percent: 0.13%
Votes: 9
Total votes: 7,009
Delaware County
Joni Ernst (REP)
Percent: 64.96%
Votes: 6,454
Theresa Greenfield (DEM)
Percent: 32.56%
Votes: 3,235
Rick Stewart (LIB)
Percent: 1.73%
Votes: 172
Suzanne Herzog (IND)
Percent: 0.71%
Votes: 71
Write-In
Percent: 0.04%
Votes: 4
Total votes: 9,936
Emmet County
Joni Ernst (REP)
Percent: 61.81%
Votes: 2,965
Theresa Greenfield (DEM)
Percent: 34.13%
Votes: 1,637
Rick Stewart (LIB)
Percent: 3.06%
Votes: 147
Suzanne Herzog (IND)
Percent: 0.98%
Votes: 47
Write-In
Percent: 0.02%
Votes: 1
Total votes: 4,797
Fremont County
Joni Ernst (REP)
Percent: 67.31%
Votes: 2,563
Theresa Greenfield (DEM)
Percent: 28.86%
Votes: 1,099
Rick Stewart (LIB)
Percent: 2.34%
Votes: 89
Suzanne Herzog (IND)
Percent: 1.47%
Votes: 56
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,808
Hamilton County
Joni Ernst (REP)
Percent: 59.42%
Votes: 4,679
Theresa Greenfield (DEM)
Percent: 36.99%
Votes: 2,913
Rick Stewart (LIB)
Percent: 2.41%
Votes: 190
Suzanne Herzog (IND)
Percent: 1.07%
Votes: 84
Write-In
Percent: 0.11%
Votes: 9
Total votes: 7,875
Henry County
Joni Ernst (REP)
Percent: 60.12%
Votes: 5,875
Theresa Greenfield (DEM)
Percent: 35.38%
Votes: 3,457
Rick Stewart (LIB)
Percent: 3.17%
Votes: 310
Suzanne Herzog (IND)
Percent: 1.19%
Votes: 116
Write-In
Percent: 0.14%
Votes: 14
Total votes: 9,772
Iowa County
Joni Ernst (REP)
Percent: 60.13%
Votes: 5,794
Theresa Greenfield (DEM)
Percent: 36.75%
Votes: 3,541
Rick Stewart (LIB)
Percent: 2.13%
Votes: 205
Suzanne Herzog (IND)
Percent: 0.87%
Votes: 84
Write-In
Percent: 0.11%
Votes: 11
Total votes: 9,635
Johnson County
Joni Ernst (REP)
Percent: 28.77%
Votes: 23,773
Theresa Greenfield (DEM)
Percent: 69.06%
Votes: 57,063
Rick Stewart (LIB)
Percent: 1.67%
Votes: 1,382
Suzanne Herzog (IND)
Percent: 0.45%
Votes: 373
Write-In
Percent: 0.05%
Votes: 42
Total votes: 82,633
Lee County
Joni Ernst (REP)
Percent: 51.29%
Votes: 8,489
Theresa Greenfield (DEM)
Percent: 44.98%
Votes: 7,445
Rick Stewart (LIB)
Percent: 2.93%
Votes: 485
Suzanne Herzog (IND)
Percent: 0.74%
Votes: 122
Write-In
Percent: 0.07%
Votes: 11
Total votes: 16,552
Lyon County
Joni Ernst (REP)
Percent: 81.80%
Votes: 5,522
Theresa Greenfield (DEM)
Percent: 15.89%
Votes: 1,073
Rick Stewart (LIB)
Percent: 1.54%
Votes: 104
Suzanne Herzog (IND)
Percent: 0.74%
Votes: 50
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,751
Marshall County
Joni Ernst (REP)
Percent: 50.68%
Votes: 9,057
Theresa Greenfield (DEM)
Percent: 45.81%
Votes: 8,187
Rick Stewart (LIB)
Percent: 2.47%
Votes: 442
Suzanne Herzog (IND)
Percent: 0.92%
Votes: 165
Write-In
Percent: 0.12%
Votes: 21
Total votes: 17,872
Monroe County
Joni Ernst (REP)
Percent: 68.40%
Votes: 2,742
Theresa Greenfield (DEM)
Percent: 28.64%
Votes: 1,148
Rick Stewart (LIB)
Percent: 2.10%
Votes: 84
Suzanne Herzog (IND)
Percent: 0.85%
Votes: 34
Write-In
Percent: 0.02%
Votes: 1
Total votes: 4,009
Osceola County
Joni Ernst (REP)
Percent: 77.38%
Votes: 2,525
Theresa Greenfield (DEM)
Percent: 20.13%
Votes: 657
Rick Stewart (LIB)
Percent: 1.50%
Votes: 49
Suzanne Herzog (IND)
Percent: 0.95%
Votes: 31
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,263
Pocahontas County
Joni Ernst (REP)
Percent: 69.87%
Votes: 2,641
Theresa Greenfield (DEM)
Percent: 26.53%
Votes: 1,003
Rick Stewart (LIB)
Percent: 2.41%
Votes: 91
Suzanne Herzog (IND)
Percent: 1.03%
Votes: 39
Write-In
Percent: 0.16%
Votes: 6
Total votes: 3,780
Ringgold County
Joni Ernst (REP)
Percent: 69.36%
Votes: 1,870
Theresa Greenfield (DEM)
Percent: 27.15%
Votes: 732
Rick Stewart (LIB)
Percent: 2.78%
Votes: 75
Suzanne Herzog (IND)
Percent: 0.59%
Votes: 16
Write-In
Percent: 0.11%
Votes: 3
Total votes: 2,696
Sioux County
Joni Ernst (REP)
Percent: 83.54%
Votes: 15,785
Theresa Greenfield (DEM)
Percent: 14.97%
Votes: 2,828
Rick Stewart (LIB)
Percent: 1.02%
Votes: 192
Suzanne Herzog (IND)
Percent: 0.43%
Votes: 81
Write-In
Percent: 0.05%
Votes: 9
Total votes: 18,895
Union County
Joni Ernst (REP)
Percent: 62.38%
Votes: 3,820
Theresa Greenfield (DEM)
Percent: 33.49%
Votes: 2,051
Rick Stewart (LIB)
Percent: 2.81%
Votes: 172
Suzanne Herzog (IND)
Percent: 1.24%
Votes: 76
Write-In
Percent: 0.08%
Votes: 5
Total votes: 6,124
Washington County
Joni Ernst (REP)
Percent: 58.12%
Votes: 6,773
Theresa Greenfield (DEM)
Percent: 38.78%
Votes: 4,519
Rick Stewart (LIB)
Percent: 2.25%
Votes: 262
Suzanne Herzog (IND)
Percent: 0.82%
Votes: 95
Write-In
Percent: 0.04%
Votes: 5
Total votes: 11,654
Winneshiek County
Joni Ernst (REP)
Percent: 50.49%
Votes: 6,039
Theresa Greenfield (DEM)
Percent: 46.66%
Votes: 5,581
Rick Stewart (LIB)
Percent: 1.82%
Votes: 218
Suzanne Herzog (IND)
Percent: 0.99%
Votes: 118
Write-In
Percent: 0.03%
Votes: 4
Total votes: 11,960