Theresa Mitchell Dudley
- 2004 – Maryland’s 4th congressional district (G) – lost
Walter W. Dudycz
- 1990 – Illinois’ 11th congressional district (R) – lost
Craig W. Duehring
- 1998 – Minnesota’s 2nd congressional district (R) – lost
John Thomas Alan Duelge
- 1988 – Wisconsin’s 7th congressional district (I) – lost
David G. Duemler
- 1996 – Oregon’s 4th congressional district (S) – lost
- 2000 – Oregon’s 4th congressional district (S) – lost
Angélica Dueñas
- 2020 – California’s 29th congressional district (D) – lost
- 2022 – California’s 29th congressional district (D) – lost
Richardo Duenez
- 1994 – California’s 50th congressional district (L) – lost
Gordon E. Duenow
- 1960 – Minnesota’s 7th congressional district (DFL) – lost
Jeff Duensing
- 2008 – Indiana’s 1st congressional district (L) – lost
Raymond James Duensing, Jr.
- 2004 – Nevada’s 1st congressional district (L) – lost
- 2006 – Nevada’s 1st congressional district (L) – lost
- 2008 – Nevada’s 1st congressional district (L) – lost
Robert F. Duer
- 1940 – Maryland’s 1st congressional district (R) – lost
Gregory Duerden
- 2018 – Utah’s 3rd congressional district (IA) – lost
Mark Duering
- 1996 – Hawaii’s 1st congressional district (I) – lost
James Duerr
- 2018 – Texas’ 27th congressional district (I) – lost
Peter Kane Dufault
- 1968 – New York’s 28th congressional district (Liberal) – lost
Andrew J. Duff
- 1992 – New York’s 5th congressional district (RTL) – lost
- 1996 – New York’s 5th congressional district (RTL) – lost
Freeman O’Dair Duff
- 1958 – West Virginia’s 6th congressional district (R) – lost
James Henderson Duff
- 1950 – United States Senate (Pennsylvania) (R) – won
- 1956 – United States Senate (Pennsylvania) (R) – lost
John B. Duff
- 1968 – New Jersey’s 12th congressional district (D) – lost
Clark Duffe
- 2010 – Oklahoma’s 5th congressional district (I) – lost
Richard Z. Duffee
- 2008 – Connecticut’s 4th congressional district (G) – lost
Ed Duffett
- 2020 – Colorado’s 5th congressional district (L) – lost
Jon Duffey
- 2000 – Florida’s 9th congressional district (Ref.) – lost
Joseph Daniel Duffey
- 1970 – United States Senate (Connecticut) (D) – lost
Warren Joseph Duffey
- 1932 – Ohio’s 9th congressional district (D) – won
- 1934 – Ohio’s 9th congressional district (D) – won
James Duffield II
- 2010 – United States Senate (Alaska) (W/I) – lost
Will Ward Duffield
- 1930 – Kentucky’s 11th congressional district (D) – lost
Elmore J. Duffy
- 1968 – California’s 3rd congressional district (R) – lost
- 1970 – California’s 3rd congressional district (R) – lost
Francis Ryan Duffy
- 1932 – United States Senate (Wisconsin) (D) – won
- 1938 – United States Senate (Wisconsin) (D) – lost
James Patrick Bernard Duffy
- 1934 – New York’s 38th congressional district (D) – won
John F. Duffy
- 1934 – United States Senate (Montana) (Special) (S) – lost
Mary C. Duffy
- 1940 – New Jersey’s 11th congressional district (D) – lost
Sean Patrick Duffy
- 2010 – Wisconsin’s 7th congressional district (R) – won
- 2012 – Wisconsin’s 7th congressional district (R) – won
- 2014 – Wisconsin’s 7th congressional district (R) – won
- 2016 – Wisconsin’s 7th congressional district (R) – won
- 2018 – Wisconsin’s 7th congressional district (R) – won
Frederick D. Dugan
- 1966 – New York’s 35th congressional district (R) – lost
Mike Dugan
- 1996 – Oregon’s 2nd congressional district (D) – lost
Steven Dugan
- 1976 – Georgia’s 3rd congressional district (R) – lost
Lee Ann Dugas
- 2014 – Louisiana’s 1st congressional district (D) – lost
- 2016 – Louisiana’s 1st congressional district (D) – lost
- 2018 – Louisiana’s 1st congressional district (D) – lost
- 2020 – Louisiana’s 1st congressional district (D) – lost
Louis Dugas, Jr.
- 1984 – Texas’ 2nd congressional district (R) – lost
Mike Dugas
- 2004 – California’s 5th congressional district (R) – lost
Robert E. Dugdale
- 1970 – Oregon’s 3rd congressional district (R) – lost
B. S. Duggan
- 1932 – Tennessee’s 8th congressional district (I) – lost
Jerome F. Duggan
- 1924 – Missouri’s 12th congressional district (D) – lost
W. S. Duggin
- 1920 – Tennessee’s 9th congressional district (S) – lost
J. Paulin Duhe
- 1948 – Louisiana’s 3rd congressional district (R) – lost
Bruce E. Duke
- 1974 – Michigan’s 17th congressional district (AI) – lost
David Ernest Duke
- 2016 – United States Senate (Louisiana) (R) – lost first round
Gregory P. Duke
- 2014 – Georgia’s 2nd congressional district (R) – lost
- 2016 – Georgia’s 2nd congressional district (R) – lost
Stephen Duke
- 2022 – United States Senate (Vermont) (I) – lost
Steven Paul Duke
- 2012 – Michigan’s 11th congressional district (G) – lost
W. R. Duke
- 1930 – Colorado’s 1st congressional district (FL) – lost
- 1932 – Colorado’s 1st congressional district (FL) – lost
