Senate Elections 2010 | US Senate Elections | Iowa Races
2010 Iowa U.S. Senate Election Results
Chuck Grassley
Percent: 64.35%
Votes: 718,215
Roxanne Conlin
Percent: 33.30%
Votes: 371,686
Race Summary
The 2010 United States Senate election in Iowa was held on November 2, 2010, with incumbent Republican Senator Chuck Grassley seeking reelection. Grassley defeated Democratic nominee Roxanne Conlin, winning 64.35% of the vote to Conlin’s 33.30%. His decisive victory reflected his long-standing popularity in Iowa and maintained Republican control of the seat.
Full Results
Chuck Grassley (REP)
Percent: 64.35%
Votes: 718,215
Roxanne Conlin (DEM)
Percent: 33.30%
Votes: 371,686
John Heiderscheit (LIB)
Percent: 2.27%
Votes: 25,290
Write-In
Percent: 0.08%
Votes: 872
Total votes: 1,116,063
State Map
Results by County
Adair County
Chuck Grassley (REP)
Percent: 72.53%
Votes: 2,220
Roxanne Conlin (DEM)
Percent: 25.42%
Votes: 778
John Heiderscheit (LIB)
Percent: 1.96%
Votes: 60
Write-In
Percent: 0.10%
Votes: 3
Total votes: 3,061
Audubon County
Chuck Grassley (REP)
Percent: 70.30%
Votes: 1,908
Roxanne Conlin (DEM)
Percent: 27.52%
Votes: 747
John Heiderscheit (LIB)
Percent: 2.17%
Votes: 59
Write-In
Percent: 0.00%
Votes: 0
Total votes: 2,714
Bremer County
Chuck Grassley (REP)
Percent: 69.34%
Votes: 6,811
Roxanne Conlin (DEM)
Percent: 28.66%
Votes: 2,815
John Heiderscheit (LIB)
Percent: 1.91%
Votes: 188
Write-In
Percent: 0.08%
Votes: 8
Total votes: 9,822
Calhoun County
Chuck Grassley (REP)
Percent: 74.16%
Votes: 2,971
Roxanne Conlin (DEM)
Percent: 24.06%
Votes: 964
John Heiderscheit (LIB)
Percent: 1.62%
Votes: 65
Write-In
Percent: 0.15%
Votes: 6
Total votes: 4,006
Cerro Gordo County
Chuck Grassley (REP)
Percent: 60.49%
Votes: 10,421
Roxanne Conlin (DEM)
Percent: 37.38%
Votes: 6,440
John Heiderscheit (LIB)
Percent: 2.09%
Votes: 360
Write-In
Percent: 0.03%
Votes: 6
Total votes: 17,227
Clay County
Chuck Grassley (REP)
Percent: 73.71%
Votes: 4,254
Roxanne Conlin (DEM)
Percent: 23.72%
Votes: 1,369
John Heiderscheit (LIB)
Percent: 2.53%
Votes: 146
Write-In
Percent: 0.03%
Votes: 2
Total votes: 5,771
Dallas County
Chuck Grassley (REP)
Percent: 71.16%
Votes: 18,126
Roxanne Conlin (DEM)
Percent: 26.44%
Votes: 6,736
John Heiderscheit (LIB)
Percent: 2.28%
Votes: 582
Write-In
Percent: 0.11%
Votes: 29
Total votes: 25,473
Des Moines County
Chuck Grassley (REP)
Percent: 54.40%
Votes: 8,083
Roxanne Conlin (DEM)
Percent: 42.84%
Votes: 6,365
John Heiderscheit (LIB)
Percent: 2.69%
Votes: 399
Write-In
Percent: 0.07%
Votes: 11
Total votes: 14,858
Fayette County
Chuck Grassley (REP)
Percent: 66.70%
Votes: 5,265
Roxanne Conlin (DEM)
Percent: 31.24%
Votes: 2,466
John Heiderscheit (LIB)
Percent: 1.98%
Votes: 156
Write-In
Percent: 0.08%
Votes: 6
Total votes: 7,893
Greene County
Chuck Grassley (REP)
Percent: 69.18%
Votes: 2,610
Roxanne Conlin (DEM)
Percent: 28.44%
Votes: 1,073
John Heiderscheit (LIB)
Percent: 2.33%
Votes: 88
Write-In
Percent: 0.05%
Votes: 2
Total votes: 3,773
Hancock County
Chuck Grassley (REP)
Percent: 72.98%
Votes: 3,384
Roxanne Conlin (DEM)
Percent: 24.67%
Votes: 1,144
John Heiderscheit (LIB)
Percent: 2.29%
Votes: 106
Write-In
Percent: 0.06%
Votes: 3
Total votes: 4,637
Howard County
Chuck Grassley (REP)
Percent: 63.90%
Votes: 2,165
Roxanne Conlin (DEM)
Percent: 34.06%
Votes: 1,154
John Heiderscheit (LIB)
Percent: 2.01%
Votes: 68
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,388
Jackson County
Chuck Grassley (REP)
Percent: 61.70%
Votes: 4,561
Roxanne Conlin (DEM)
Percent: 35.24%
Votes: 2,605
John Heiderscheit (LIB)
Percent: 3.03%
Votes: 224
Write-In
Percent: 0.03%
Votes: 2
Total votes: 7,392
Jones County
Chuck Grassley (REP)
Percent: 67.91%
Votes: 5,236
Roxanne Conlin (DEM)
Percent: 29.42%
Votes: 2,268
John Heiderscheit (LIB)
Percent: 2.63%
Votes: 203
Write-In
Percent: 0.04%
Votes: 3
Total votes: 7,710
Linn County
Chuck Grassley (REP)
Percent: 60.55%
Votes: 48,488
Roxanne Conlin (DEM)
Percent: 37.17%
Votes: 29,764
John Heiderscheit (LIB)
Percent: 2.23%
Votes: 1,782
Write-In
Percent: 0.06%
Votes: 48
Total votes: 80,082
Madison County
Chuck Grassley (REP)
Percent: 70.49%
Votes: 4,753
Roxanne Conlin (DEM)
Percent: 26.84%
Votes: 1,810
John Heiderscheit (LIB)
Percent: 2.57%
Votes: 173
Write-In
Percent: 0.10%
Votes: 7
Total votes: 6,743
Mills County
Chuck Grassley (REP)
Percent: 75.33%
Votes: 3,633
Roxanne Conlin (DEM)
Percent: 22.14%
Votes: 1,068
John Heiderscheit (LIB)
Percent: 2.49%
Votes: 120
Write-In
Percent: 0.04%
Votes: 2
Total votes: 4,823
Montgomery County
Chuck Grassley (REP)
Percent: 77.50%
Votes: 2,824
Roxanne Conlin (DEM)
Percent: 19.81%
Votes: 722
John Heiderscheit (LIB)
Percent: 2.69%
Votes: 98
Write-In
Percent: 0.00%
Votes: 0
Total votes: 3,644
Page County
Chuck Grassley (REP)
Percent: 78.13%
Votes: 3,751
Roxanne Conlin (DEM)
Percent: 19.68%
Votes: 945
John Heiderscheit (LIB)
Percent: 2.19%
Votes: 105
Write-In
Percent: 0.00%
Votes: 0
Total votes: 4,801
Polk County
Chuck Grassley (REP)
Percent: 59.92%
Votes: 96,219
Roxanne Conlin (DEM)
Percent: 38.09%
Votes: 61,170
John Heiderscheit (LIB)
Percent: 1.87%
Votes: 3,009
Write-In
Percent: 0.11%
Votes: 184
Total votes: 160,582
Sac County
Chuck Grassley (REP)
Percent: 77.19%
Votes: 3,035
Roxanne Conlin (DEM)
Percent: 20.73%
Votes: 815
John Heiderscheit (LIB)
Percent: 1.96%
Votes: 77
Write-In
Percent: 0.13%
Votes: 5
Total votes: 3,932
Story County
Chuck Grassley (REP)
Percent: 60.20%
Votes: 19,430
Roxanne Conlin (DEM)
Percent: 37.27%
Votes: 12,029
John Heiderscheit (LIB)
Percent: 2.44%
Votes: 788
Write-In
Percent: 0.10%
Votes: 31
Total votes: 32,278
Van Buren County
Chuck Grassley (REP)
Percent: 67.44%
Votes: 1,916
Roxanne Conlin (DEM)
Percent: 28.41%
Votes: 807
John Heiderscheit (LIB)
Percent: 4.05%
Votes: 115
Write-In
Percent: 0.11%
Votes: 3
Total votes: 2,841
Wayne County
Chuck Grassley (REP)
Percent: 72.76%
Votes: 1,683
Roxanne Conlin (DEM)
Percent: 25.16%
Votes: 582
John Heiderscheit (LIB)
Percent: 1.95%
Votes: 45
Write-In
Percent: 0.13%
Votes: 3
Total votes: 2,313
Woodbury County
Chuck Grassley (REP)
Percent: 67.40%
Votes: 20,895
Roxanne Conlin (DEM)
Percent: 30.52%
Votes: 9,461
John Heiderscheit (LIB)
Percent: 2.00%
Votes: 621
Write-In
Percent: 0.08%
Votes: 26
Total votes: 31,003
Adams County
Chuck Grassley (REP)
Percent: 71.45%
Votes: 1,234
Roxanne Conlin (DEM)
Percent: 25.59%
Votes: 442
John Heiderscheit (LIB)
Percent: 2.84%
Votes: 49
Write-In
Percent: 0.12%
Votes: 2
Total votes: 1,727
Benton County
Chuck Grassley (REP)
Percent: 69.49%
Votes: 6,936
Roxanne Conlin (DEM)
Percent: 28.01%
Votes: 2,796
John Heiderscheit (LIB)
Percent: 2.48%
Votes: 248
Write-In
Percent: 0.01%
Votes: 1
Total votes: 9,981
Buchanan County
Chuck Grassley (REP)
Percent: 67.06%
Votes: 5,291
Roxanne Conlin (DEM)
Percent: 31.00%
Votes: 2,446
John Heiderscheit (LIB)
Percent: 1.90%
Votes: 150
Write-In
Percent: 0.04%
Votes: 3
Total votes: 7,890
Carroll County
Chuck Grassley (REP)
Percent: 69.81%
Votes: 5,731
Roxanne Conlin (DEM)
Percent: 28.16%
Votes: 2,312
John Heiderscheit (LIB)
Percent: 1.91%
Votes: 157
Write-In
Percent: 0.12%
Votes: 10
Total votes: 8,210
Cherokee County
Chuck Grassley (REP)
Percent: 76.88%
Votes: 3,632
Roxanne Conlin (DEM)
Percent: 21.19%
Votes: 1,001
John Heiderscheit (LIB)
Percent: 1.88%
Votes: 89
Write-In
Percent: 0.04%
Votes: 2
Total votes: 4,724
Clayton County
Chuck Grassley (REP)
Percent: 66.64%
Votes: 4,632
Roxanne Conlin (DEM)
Percent: 30.30%
Votes: 2,106
John Heiderscheit (LIB)
Percent: 3.04%
Votes: 211
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,951
Davis County
Chuck Grassley (REP)
Percent: 66.32%
Votes: 2,042
Roxanne Conlin (DEM)
Percent: 29.46%
Votes: 907
John Heiderscheit (LIB)
Percent: 4.06%
Votes: 125
Write-In
Percent: 0.16%
Votes: 5
Total votes: 3,079
Dickinson County
Chuck Grassley (REP)
Percent: 71.86%
Votes: 5,191
Roxanne Conlin (DEM)
Percent: 26.12%
Votes: 1,887
John Heiderscheit (LIB)
Percent: 1.98%
Votes: 143
Write-In
Percent: 0.04%
Votes: 3
Total votes: 7,224
Floyd County
Chuck Grassley (REP)
Percent: 62.60%
Votes: 3,793
Roxanne Conlin (DEM)
Percent: 35.09%
Votes: 2,126
John Heiderscheit (LIB)
Percent: 2.31%
Votes: 140
Write-In
Percent: 0.00%
Votes: 0
Total votes: 6,059
Grundy County
Chuck Grassley (REP)
Percent: 79.24%
Votes: 4,191
Roxanne Conlin (DEM)
Percent: 18.72%
Votes: 990
John Heiderscheit (LIB)
Percent: 1.83%
Votes: 97
Write-In
Percent: 0.21%
Votes: 11
Total votes: 5,289
Hardin County
Chuck Grassley (REP)
Percent: 71.71%
Votes: 4,760
Roxanne Conlin (DEM)
Percent: 26.33%
Votes: 1,748
John Heiderscheit (LIB)
Percent: 1.88%
Votes: 125
Write-In
Percent: 0.08%
Votes: 5
Total votes: 6,638
Humboldt County
Chuck Grassley (REP)
Percent: 75.62%
Votes: 2,966
Roxanne Conlin (DEM)
Percent: 22.16%
Votes: 869
John Heiderscheit (LIB)
Percent: 2.22%
Votes: 87
Write-In
Percent: 0.00%
Votes: 0
Total votes: 3,922
Jasper County
Chuck Grassley (REP)
Percent: 64.23%
Votes: 9,614
Roxanne Conlin (DEM)
Percent: 33.61%
Votes: 5,031
John Heiderscheit (LIB)
Percent: 2.04%
Votes: 306
Write-In
Percent: 0.11%
Votes: 16
Total votes: 14,967
Keokuk County
Chuck Grassley (REP)
Percent: 73.31%
Votes: 2,832
Roxanne Conlin (DEM)
Percent: 23.69%
Votes: 915
John Heiderscheit (LIB)
Percent: 2.85%
Votes: 110
Write-In
Percent: 0.16%
Votes: 6
Total votes: 3,863
Louisa County
Chuck Grassley (REP)
Percent: 71.63%
Votes: 2,411
Roxanne Conlin (DEM)
Percent: 25.52%
Votes: 859
John Heiderscheit (LIB)
Percent: 2.82%
Votes: 95
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,366
Mahaska County
Chuck Grassley (REP)
Percent: 75.80%
Votes: 6,376
Roxanne Conlin (DEM)
Percent: 22.18%
Votes: 1,866
John Heiderscheit (LIB)
Percent: 1.93%
Votes: 162
Write-In
Percent: 0.10%
Votes: 8
Total votes: 8,412
Mitchell County
Chuck Grassley (REP)
Percent: 69.59%
Votes: 3,121
Roxanne Conlin (DEM)
Percent: 28.41%
Votes: 1,274
John Heiderscheit (LIB)
Percent: 1.94%
Votes: 87
Write-In
Percent: 0.07%
Votes: 3
Total votes: 4,485
Muscatine County
Chuck Grassley (REP)
Percent: 60.28%
Votes: 7,974
Roxanne Conlin (DEM)
Percent: 36.83%
Votes: 4,872
John Heiderscheit (LIB)
Percent: 2.85%
Votes: 377
Write-In
Percent: 0.05%
Votes: 6
Total votes: 13,229
Palo Alto County
Chuck Grassley (REP)
Percent: 68.29%
Votes: 2,653
Roxanne Conlin (DEM)
Percent: 29.32%
Votes: 1,139
John Heiderscheit (LIB)
Percent: 2.39%
Votes: 93
Write-In
Percent: 0.00%
Votes: 0
Total votes: 3,885
Pottawattamie County
Chuck Grassley (REP)
Percent: 67.52%
Votes: 17,916
Roxanne Conlin (DEM)
Percent: 29.80%
Votes: 7,907
John Heiderscheit (LIB)
Percent: 2.53%
Votes: 671
Write-In
Percent: 0.15%
Votes: 40
Total votes: 26,534
Scott County
Chuck Grassley (REP)
Percent: 58.75%
Votes: 33,050
Roxanne Conlin (DEM)
Percent: 38.38%
Votes: 21,592
John Heiderscheit (LIB)
Percent: 2.81%
Votes: 1,583
Write-In
Percent: 0.06%
Votes: 33
Total votes: 56,258
Tama County
Chuck Grassley (REP)
Percent: 66.55%
Votes: 4,323
Roxanne Conlin (DEM)
Percent: 31.14%
Votes: 2,023
John Heiderscheit (LIB)
Percent: 2.28%
Votes: 148
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,496
Wapello County
Chuck Grassley (REP)
Percent: 54.03%
Votes: 6,308
Roxanne Conlin (DEM)
Percent: 42.87%
Votes: 5,006
John Heiderscheit (LIB)
Percent: 2.99%
Votes: 349
Write-In
Percent: 0.11%
Votes: 13
Total votes: 11,676
Webster County
Chuck Grassley (REP)
Percent: 65.08%
Votes: 8,533
Roxanne Conlin (DEM)
Percent: 33.21%
Votes: 4,355
John Heiderscheit (LIB)
Percent: 1.66%
Votes: 218
Write-In
Percent: 0.05%
Votes: 6
Total votes: 13,112
Worth County
Chuck Grassley (REP)
Percent: 64.08%
Votes: 2,046
Roxanne Conlin (DEM)
Percent: 33.42%
Votes: 1,067
John Heiderscheit (LIB)
Percent: 2.51%
Votes: 80
Write-In
Percent: 0.00%
Votes: 0
Total votes: 3,193
Allamakee County
Chuck Grassley (REP)
Percent: 68.14%
Votes: 3,584
Roxanne Conlin (DEM)
Percent: 26.92%
Votes: 1,416
John Heiderscheit (LIB)
Percent: 4.92%
Votes: 259
Write-In
Percent: 0.02%
Votes: 1
Total votes: 5,260
Black Hawk County
Chuck Grassley (REP)
Percent: 60.20%
Votes: 27,099
Roxanne Conlin (DEM)
Percent: 38.02%
Votes: 17,114
John Heiderscheit (LIB)
Percent: 1.71%
Votes: 771
Write-In
Percent: 0.06%
Votes: 29
Total votes: 45,013
Buena Vista County
Chuck Grassley (REP)
Percent: 75.80%
Votes: 4,237
Roxanne Conlin (DEM)
Percent: 22.16%
Votes: 1,239
John Heiderscheit (LIB)
Percent: 1.97%
Votes: 110
Write-In
Percent: 0.07%
Votes: 4
Total votes: 5,590
Cass County
Chuck Grassley (REP)
Percent: 75.64%
Votes: 3,930
Roxanne Conlin (DEM)
Percent: 22.21%
Votes: 1,154
John Heiderscheit (LIB)
Percent: 2.06%
Votes: 107
Write-In
Percent: 0.10%
Votes: 5
Total votes: 5,196
Chickasaw County
Chuck Grassley (REP)
Percent: 67.44%
Votes: 3,331
Roxanne Conlin (DEM)
Percent: 30.53%
Votes: 1,508
John Heiderscheit (LIB)
Percent: 2.00%
Votes: 99
Write-In
Percent: 0.02%
Votes: 1
Total votes: 4,939
Clinton County
Chuck Grassley (REP)
Percent: 59.21%
Votes: 10,189
Roxanne Conlin (DEM)
Percent: 38.35%
Votes: 6,600
John Heiderscheit (LIB)
Percent: 2.38%
Votes: 409
Write-In
Percent: 0.06%
Votes: 10
Total votes: 17,208
Decatur County
Chuck Grassley (REP)
Percent: 67.37%
Votes: 1,937
Roxanne Conlin (DEM)
Percent: 29.43%
Votes: 846
John Heiderscheit (LIB)
Percent: 3.13%
Votes: 90
Write-In
Percent: 0.07%
Votes: 2
Total votes: 2,875
Dubuque County
Chuck Grassley (REP)
Percent: 58.66%
Votes: 19,634
Roxanne Conlin (DEM)
Percent: 38.66%
Votes: 12,941
John Heiderscheit (LIB)
Percent: 2.63%
Votes: 880
Write-In
Percent: 0.04%
Votes: 15
Total votes: 33,470
Franklin County
Chuck Grassley (REP)
Percent: 74.59%
Votes: 2,859
Roxanne Conlin (DEM)
Percent: 23.25%
Votes: 891
John Heiderscheit (LIB)
Percent: 2.14%
Votes: 82
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,833
Guthrie County
Chuck Grassley (REP)
Percent: 69.67%
Votes: 3,181
Roxanne Conlin (DEM)
Percent: 27.11%
Votes: 1,238
John Heiderscheit (LIB)
Percent: 3.18%
Votes: 145
Write-In
Percent: 0.04%
Votes: 2
Total votes: 4,566
Harrison County
Chuck Grassley (REP)
Percent: 73.72%
Votes: 3,874
Roxanne Conlin (DEM)
Percent: 23.60%
Votes: 1,240
John Heiderscheit (LIB)
Percent: 2.63%
Votes: 138
Write-In
Percent: 0.06%
Votes: 3
Total votes: 5,255
Ida County
Chuck Grassley (REP)
Percent: 82.20%
Votes: 2,194
Roxanne Conlin (DEM)
Percent: 15.81%
Votes: 422
John Heiderscheit (LIB)
Percent: 1.99%
Votes: 53
Write-In
Percent: 0.00%
Votes: 0
Total votes: 2,669
Jefferson County
Chuck Grassley (REP)
Percent: 51.50%
Votes: 3,429
Roxanne Conlin (DEM)
Percent: 44.86%
Votes: 2,987
John Heiderscheit (LIB)
Percent: 3.50%
Votes: 233
Write-In
Percent: 0.14%
Votes: 9
Total votes: 6,658
Kossuth County
Chuck Grassley (REP)
Percent: 69.42%
Votes: 4,688
Roxanne Conlin (DEM)
Percent: 28.55%
Votes: 1,928
John Heiderscheit (LIB)
Percent: 2.00%
Votes: 135
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,753
Lucas County
Chuck Grassley (REP)
Percent: 69.81%
Votes: 2,470
Roxanne Conlin (DEM)
Percent: 27.33%
Votes: 967
John Heiderscheit (LIB)
Percent: 2.71%
Votes: 96
Write-In
Percent: 0.14%
Votes: 5
Total votes: 3,538
Marion County
Chuck Grassley (REP)
Percent: 71.54%
Votes: 9,326
Roxanne Conlin (DEM)
Percent: 26.15%
Votes: 3,409
John Heiderscheit (LIB)
Percent: 2.15%
Votes: 280
Write-In
Percent: 0.16%
Votes: 21
Total votes: 13,036
Monona County
Chuck Grassley (REP)
Percent: 73.26%
Votes: 2,578
Roxanne Conlin (DEM)
Percent: 25.04%
Votes: 881
John Heiderscheit (LIB)
Percent: 1.68%
Votes: 59
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,519
O'Brien County
Chuck Grassley (REP)
Percent: 83.12%
Votes: 4,556
Roxanne Conlin (DEM)
Percent: 15.16%
Votes: 831
John Heiderscheit (LIB)
Percent: 1.70%
Votes: 93
Write-In
Percent: 0.02%
Votes: 1
Total votes: 5,481
Plymouth County
Chuck Grassley (REP)
Percent: 82.12%
Votes: 7,219
Roxanne Conlin (DEM)
Percent: 16.18%
Votes: 1,422
John Heiderscheit (LIB)
Percent: 1.66%
Votes: 146
Write-In
Percent: 0.05%
Votes: 4
Total votes: 8,791
Poweshiek County
Chuck Grassley (REP)
Percent: 61.47%
Votes: 4,594
Roxanne Conlin (DEM)
Percent: 36.74%
Votes: 2,746
John Heiderscheit (LIB)
Percent: 1.74%
Votes: 130
Write-In
Percent: 0.05%
Votes: 4
Total votes: 7,474
Shelby County
Chuck Grassley (REP)
Percent: 76.34%
Votes: 3,166
Roxanne Conlin (DEM)
Percent: 21.34%
Votes: 885
John Heiderscheit (LIB)
Percent: 2.27%
Votes: 94
Write-In
Percent: 0.05%
Votes: 2
Total votes: 4,147
Taylor County
Chuck Grassley (REP)
Percent: 74.52%
Votes: 1,866
Roxanne Conlin (DEM)
Percent: 23.20%
Votes: 581
John Heiderscheit (LIB)
Percent: 2.28%
Votes: 57
Write-In
Percent: 0.00%
Votes: 0
Total votes: 2,504
Warren County
Chuck Grassley (REP)
Percent: 65.86%
Votes: 13,273
Roxanne Conlin (DEM)
Percent: 31.90%
Votes: 6,429
John Heiderscheit (LIB)
Percent: 2.16%
Votes: 436
Write-In
Percent: 0.07%
Votes: 14
Total votes: 20,152
Winnebago County
Chuck Grassley (REP)
Percent: 69.77%
Votes: 3,062
Roxanne Conlin (DEM)
Percent: 28.16%
Votes: 1,236
John Heiderscheit (LIB)
Percent: 2.05%
Votes: 90
Write-In
Percent: 0.02%
Votes: 1
Total votes: 4,389
Wright County
Chuck Grassley (REP)
Percent: 72.69%
Votes: 3,554
Roxanne Conlin (DEM)
Percent: 25.77%
Votes: 1,260
John Heiderscheit (LIB)
Percent: 1.49%
Votes: 73
Write-In
Percent: 0.04%
Votes: 2
Total votes: 4,889
Appanoose County
Chuck Grassley (REP)
Percent: 66.35%
Votes: 3,050
Roxanne Conlin (DEM)
Percent: 30.41%
Votes: 1,398
John Heiderscheit (LIB)
Percent: 3.13%
Votes: 144
Write-In
Percent: 0.11%
Votes: 5
Total votes: 4,597
Boone County
Chuck Grassley (REP)
Percent: 65.43%
Votes: 7,014
Roxanne Conlin (DEM)
Percent: 32.25%
Votes: 3,457
John Heiderscheit (LIB)
Percent: 2.28%
Votes: 244
Write-In
Percent: 0.05%
Votes: 5
Total votes: 10,720
Butler County
Chuck Grassley (REP)
Percent: 76.07%
Votes: 4,339
Roxanne Conlin (DEM)
Percent: 22.05%
Votes: 1,258
John Heiderscheit (LIB)
Percent: 1.86%
Votes: 106
Write-In
Percent: 0.02%
Votes: 1
Total votes: 5,704
Cedar County
Chuck Grassley (REP)
Percent: 66.41%
Votes: 4,660
Roxanne Conlin (DEM)
Percent: 30.61%
Votes: 2,148
John Heiderscheit (LIB)
Percent: 2.94%
Votes: 206
Write-In
Percent: 0.04%
Votes: 3
Total votes: 7,017
Clarke County
Chuck Grassley (REP)
Percent: 69.08%
Votes: 2,551
Roxanne Conlin (DEM)
Percent: 28.19%
Votes: 1,041
John Heiderscheit (LIB)
Percent: 2.65%
Votes: 98
Write-In
Percent: 0.08%
Votes: 3
Total votes: 3,693
Crawford County
Chuck Grassley (REP)
Percent: 73.83%
Votes: 3,749
Roxanne Conlin (DEM)
Percent: 23.65%
Votes: 1,201
John Heiderscheit (LIB)
Percent: 2.48%
Votes: 126
Write-In
Percent: 0.04%
Votes: 2
Total votes: 5,078
Delaware County
Chuck Grassley (REP)
Percent: 72.46%
Votes: 5,048
Roxanne Conlin (DEM)
Percent: 24.89%
Votes: 1,734
John Heiderscheit (LIB)
Percent: 2.58%
Votes: 180
Write-In
Percent: 0.07%
Votes: 5
Total votes: 6,967
Emmet County
Chuck Grassley (REP)
Percent: 68.37%
Votes: 2,419
Roxanne Conlin (DEM)
Percent: 29.68%
Votes: 1,050
John Heiderscheit (LIB)
Percent: 1.89%
Votes: 67
Write-In
Percent: 0.06%
Votes: 2
Total votes: 3,538
Fremont County
Chuck Grassley (REP)
Percent: 74.36%
Votes: 1,949
Roxanne Conlin (DEM)
Percent: 22.70%
Votes: 595
John Heiderscheit (LIB)
Percent: 2.94%
Votes: 77
Write-In
Percent: 0.00%
Votes: 0
Total votes: 2,621
Hamilton County
Chuck Grassley (REP)
Percent: 68.11%
Votes: 4,226
Roxanne Conlin (DEM)
Percent: 29.91%
Votes: 1,856
John Heiderscheit (LIB)
Percent: 1.93%
Votes: 120
Write-In
Percent: 0.05%
Votes: 3
Total votes: 6,205
Henry County
Chuck Grassley (REP)
Percent: 69.34%
Votes: 4,723
Roxanne Conlin (DEM)
Percent: 28.13%
Votes: 1,916
John Heiderscheit (LIB)
Percent: 2.50%
Votes: 170
Write-In
Percent: 0.03%
Votes: 2
Total votes: 6,811
Iowa County
Chuck Grassley (REP)
Percent: 71.56%
Votes: 4,673
Roxanne Conlin (DEM)
Percent: 25.62%
Votes: 1,673
John Heiderscheit (LIB)
Percent: 2.59%
Votes: 169
Write-In
Percent: 0.23%
Votes: 15
Total votes: 6,530
Johnson County
Chuck Grassley (REP)
Percent: 47.13%
Votes: 24,347
Roxanne Conlin (DEM)
Percent: 50.42%
Votes: 26,047
John Heiderscheit (LIB)
Percent: 2.30%
Votes: 1,187
Write-In
Percent: 0.15%
Votes: 75
Total votes: 51,656
Lee County
Chuck Grassley (REP)
Percent: 51.45%
Votes: 6,050
Roxanne Conlin (DEM)
Percent: 44.87%
Votes: 5,276
John Heiderscheit (LIB)
Percent: 3.63%
Votes: 427
Write-In
Percent: 0.04%
Votes: 5
Total votes: 11,758
Lyon County
Chuck Grassley (REP)
Percent: 85.47%
Votes: 4,269
Roxanne Conlin (DEM)
Percent: 12.41%
Votes: 620
John Heiderscheit (LIB)
Percent: 2.12%
Votes: 106
Write-In
Percent: 0.00%
Votes: 0
Total votes: 4,995
Marshall County
Chuck Grassley (REP)
Percent: 63.50%
Votes: 9,026
Roxanne Conlin (DEM)
Percent: 34.02%
Votes: 4,836
John Heiderscheit (LIB)
Percent: 2.40%
Votes: 341
Write-In
Percent: 0.08%
Votes: 12
Total votes: 14,215
Monroe County
Chuck Grassley (REP)
Percent: 68.81%
Votes: 1,983
Roxanne Conlin (DEM)
Percent: 28.70%
Votes: 827
John Heiderscheit (LIB)
Percent: 2.29%
Votes: 66
Write-In
Percent: 0.21%
Votes: 6
Total votes: 2,882
Osceola County
Chuck Grassley (REP)
Percent: 83.74%
Votes: 2,013
Roxanne Conlin (DEM)
Percent: 13.44%
Votes: 323
John Heiderscheit (LIB)
Percent: 2.75%
Votes: 66
Write-In
Percent: 0.08%
Votes: 2
Total votes: 2,404
Pocahontas County
Chuck Grassley (REP)
Percent: 76.08%
Votes: 2,296
Roxanne Conlin (DEM)
Percent: 21.67%
Votes: 654
John Heiderscheit (LIB)
Percent: 2.22%
Votes: 67
Write-In
Percent: 0.03%
Votes: 1
Total votes: 3,018
Ringgold County
Chuck Grassley (REP)
Percent: 71.99%
Votes: 1,537
Roxanne Conlin (DEM)
Percent: 25.85%
Votes: 552
John Heiderscheit (LIB)
Percent: 2.15%
Votes: 46
Write-In
Percent: 0.00%
Votes: 0
Total votes: 2,135
Sioux County
Chuck Grassley (REP)
Percent: 91.33%
Votes: 11,677
Roxanne Conlin (DEM)
Percent: 7.61%
Votes: 973
John Heiderscheit (LIB)
Percent: 1.01%
Votes: 129
Write-In
Percent: 0.05%
Votes: 6
Total votes: 12,785
Union County
Chuck Grassley (REP)
Percent: 68.27%
Votes: 3,257
Roxanne Conlin (DEM)
Percent: 29.36%
Votes: 1,401
John Heiderscheit (LIB)
Percent: 2.28%
Votes: 109
Write-In
Percent: 0.08%
Votes: 4
Total votes: 4,771
Washington County
Chuck Grassley (REP)
Percent: 70.98%
Votes: 6,152
Roxanne Conlin (DEM)
Percent: 26.31%
Votes: 2,280
John Heiderscheit (LIB)
Percent: 2.67%
Votes: 231
Write-In
Percent: 0.05%
Votes: 4
Total votes: 8,667
Winneshiek County
Chuck Grassley (REP)
Percent: 63.51%
Votes: 5,179
Roxanne Conlin (DEM)
Percent: 33.92%
Votes: 2,766
John Heiderscheit (LIB)
Percent: 2.53%
Votes: 206
Write-In
Percent: 0.04%
Votes: 3
Total votes: 8,154