Iowa's 5th congressional district, 1972
- William J. Scherle (R) (inc.) - 108,596 (55.26%)
- Tom Harkin (D) - 87,937 (44.74%)
Iowa's 5th congressional district, 1974
- Tom Harkin (D) - 81,146 (51.09%)
- William J. Scherle (R) (inc.) - 77,683 (48.91%)
Iowa's 5th congressional district, 1976
- Tom Harkin (D) (inc.) - 135,600 (64.86%)
- Kenneth R. Fulk (R) - 71,377 (34.14%)
- Verlyn Leroy Hayes (American Independent) - 2,075 (0.99%)
Iowa's 5th congressional district, 1978
- Tom Harkin (D) (inc.) - 82,333 (58.93%)
- Julian B. Garrett (R) - 57,377 (41.07%)
Iowa's 5th congressional district, 1980
- Tom Harkin (D) (inc.) - 127,895 (60.22%)
- Cal Hultman (R) - 84,472 (39.78%)
Iowa's 5th congressional district, 1982
- Tom Harkin (D) (inc.) - 93,333 (58.86%)
- Arlyn E. Danker (R) - 65,200 (41.12%)
United States Senate election in Iowa, 1984
- Tom Harkin (D) - 716,883 (55.46%)
- Roger Jepsen (R) (inc.) - 564,381 (43.66%)
- Garry De Young (Independence) - 11,014 (0.85%)
United States Senate election in Iowa, 1990
- Tom Harkin (D) (inc.) - 535,975 (54.47%)
- Thomas J. Tauke (R) - 446,869 (45.42%)
Democratic Iowa caucuses, 1992
- Tom Harkin - 764 (76.55%)
- Uncommitted - 119 (11.92%)
- Paul Tsongas - 41 (4.11%)
- Bill Clinton - 28 (2.81%)
- Bob Kerrey - 24 (2.41%)
- Jerry Brown - 16 (1.60%)
- Others - 6 (0.60%)
United States presidential election, 1992 (Democratic primaries)
- Bill Clinton - 10,482,411 (52.01%)
- Jerry Brown - 4,071,232 (20.20%)
- Paul Tsongas - 3,656,010 (18.14%)
- Unpledged - 750,873 (3.73%)
- Bob Kerrey - 318,457 (1.58%)
- Tom Harkin - 280,304 (1.39%)
- Lyndon LaRouche - 154,599 (0.77%)
- Eugene McCarthy - 108,678 (0.54%)
- Charles Woods - 88,948 (0.44%)
- Larry Agran - 58,611 (0.29%)
- Ross Perot - 54,755 (0.27%)
- Ralph Nader - 35,935 (0.18%)
- Louis Stokes - 29,983 (0.15%)
- Angus Wheeler McDonald - 9,900 (0.05%)
- J. Louis McAlpine - 7,911 (0.04%)
- George W. Benns - 7,887 (0.04%)
- Rufus T. Higginbotham - 7,705 (0.04%)
- Tom Howard Hawks - 7,434 (0.04%)
- Stephen Bruke - 5,261 (0.03%)
- Tom Laughin - 5,202 (0.03%)
- Tom Shiekman - 4,965 (0.03%)
- Jeffrey F. Marsh - 2,445 (0.01%)
- George Ballard - 2,067 (0.01%)
- Ray Rollinson - 1,206 (0.01%)
- Leonora Fulani - 402 (0.00%)
- Douglas Wilder - 240 (0.00%)
Iowa United States Senate election, 1996 (Democratic primary)
- Tom Harkin (inc.) - 98,737 (99.19%)
- Others - 810 (0.81%)
United States Senate election in Iowa, 1996
- Tom Harkin (D) (inc.) - 634,166 (51.81%)
- James Lightfoot (R) - 571,807 (46.71%)
- Sue Atkinson (I) - 9,768 (0.80%)
- Fred Gratzon (Natural Law) - 4,248 (0.35%)
- Joe Sulentic (I) - 1,941 (0.16%)
- Shirley E. Pena (Socialist Workers) - 1,844 (0.15%)
Iowa United States Senate election, 2002 (Democratic primary)
- Tom Harkin (inc.) - 83,505 (99.34%)
- Write-ins - 555 (0.66%)
United States Senate election in Iowa, 2002
- Tom Harkin (D) (inc.) - 554,278 (54.18%)
- Greg Ganske (R) - 447,892 (43.78%)
- Tim Harthan (Green) - 11,340 (1.11%)
- Richard J. Moore (Libertarian) - 8,864 (0.87%)
United States Senate election in Iowa, 2008
- Tom Harkin (D) (inc.) - 925,630 62.52%
- Christopher Reed (R)- 553,995 37.42%
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