Robert H. Clarke
- 1920 – Wisconsin’s 7th congressional district (Proh.) – lost
Thomas A. Clarke
- 1930 – Texas’ 1st congressional district (R) – lost
Una S. T. Clarke
- 2000 – New York’s 11th congressional district (Liberal) – lost
William P. Clarke
- 1928 – Ohio’s 9th congressional district (D) – lost
Yvette Diane Clarke
- 2006 – New York’s 11th congressional district (D, WF) – won
- 2008 – New York’s 11th congressional district (D, WF) – won
- 2010 – New York’s 11th congressional district (D) – won
- 2012 – New York’s 9th congressional district (D, WF) – won
- 2014 – New York’s 9th congressional district (D, WF) – won
- 2016 – New York’s 9th congressional district (D, WF) – won
- 2018 – New York’s 9th congressional district (D, WF) – won
- 2020 – New York’s 9th congressional district (D, WF) – won
- 2022 – New York’s 9th congressional district (D) – won
H. W. Clarkson
- 1944 – South Dakota’s 2nd congressional district (D) – lost
M. W. Clarkson
- 1962 – South Dakota’s 2nd congressional district (D) – lost
Robert Barnwell Clarkson II
- 1992 – United States Senate (South Carolina) (American) – lost
Charles Russell Clason
- 1934 – Massachusetts’ 2nd congressional district (R) – lost
- 1936 – Massachusetts’ 2nd congressional district (R) – won
- 1938 – Massachusetts’ 2nd congressional district (R) – won
- 1940 – Massachusetts’ 2nd congressional district (R) – won
- 1942 – Massachusetts’ 2nd congressional district (R) – won
- 1944 – Massachusetts’ 2nd congressional district (R) – won
- 1946 – Massachusetts’ 2nd congressional district (R) – won
- 1948 – Massachusetts’ 2nd congressional district (R) – lost
George A. Clason
- 1944 – Missouri’s 6th congressional district (D) – lost
Adolph Class
- 1924 – Pennsylvania’s 4th congressional district (D) – lost
Joseph C. Class
- 1932 – New York’s 4th congressional district (S) – lost
George C. Classen
- 1944 – Iowa’s 2nd congressional district (D) – lost
Russell H. Classen
- 1948 – Illinois’ 25th congressional district (R) – lost
August Claessens
- 1946 – New York’s 10th congressional district (Liberal) – lost
- 1948 – New York’s 8th congressional district (Liberal) – lost
- 1950 – New York’s 8th congressional district (Liberal) – lost
David Guy Classon
- 1920 – Wisconsin’s 9th congressional district (R) – won
Raymond J. Clatworthy
- 1996 – United States Senate (Delaware) (R) – lost
- 2002 – United States Senate (Delaware) (R) – lost
Robert W. Claunch
- 1998 – Mississippi’s 5th congressional district (Ref.) – lost
- 2012 – Mississippi’s 4th congressional district (Ref.) – lost
Donald Holst Clausen
- 1962 – California’s 1st congressional district (R) – lost
- 1963 – California’s 1st congressional district (Special) (R) – won
- 1964 – California’s 1st congressional district (R) – won
- 1966 – California’s 1st congressional district (R) – won
- 1968 – California’s 1st congressional district (R) – won
- 1970 – California’s 1st congressional district (R) – won
- 1972 – California’s 1st congressional district (R) – won
- 1974 – California’s 2nd congressional district (R) – won
- 1976 – California’s 2nd congressional district (R) – won
- 1978 – California’s 2nd congressional district (R) – won
- 1980 – California’s 2nd congressional district (R) – won
- 1982 – California’s 1st congressional district (R) – lost
Fred H. Clausen
- 1940 – United States Senate (Wisconsin) (R) – lost
Vincent Clausen
- 1938 – New Jersey’s 9th congressional district (D) – lost
Curtis Jay Clawson
- 2014 – Florida’s 19th congressional district (Special) (R) – won
- 2014 – Florida’s 19th congressional district (R) – won
Delwin Morgan Clawson
- 1962 – California’s 23rd congressional district (R) – lost
- 1963 – California’s 23rd congressional district (Special) (R) – won
- 1964 – California’s 23rd congressional district (R) – won
- 1966 – California’s 23rd congressional district (R) – won
- 1968 – California’s 23rd congressional district (R) – won
- 1970 – California’s 23rd congressional district (R) – won
- 1972 – California’s 23rd congressional district (R) – won
- 1974 – California’s 33rd congressional district (R) – won
- 1976 – California’s 33rd congressional district (R) – won
Erica Clawson
- 2016 – Vermont’s at large congressional district (LU) – lost
Mike Clawson
- 2000 – Wisconsin’s 9th congressional district (D) – lost
Edith Claxton
- 1952 – New Jersey’s 8th congressional district (Proh.) – lost
Calder Clay
- 2002 – Georgia’s 3rd congressional district (R) – lost
- 2004 – Georgia’s 3rd congressional district (R) – lost
George E. Clay
- 1956 – Michigan’s 5th congressional district (D) – lost
Horace B. Clay
- 1956 – Virginia’s 8th congressional district (R) – lost
Michelle Clay
- 2008 – California’s 8th congressional district (I-W/I) – lost
Ricky L. Clay
- 2000 – Texas’ 12th congressional district (L) – lost
William Lacy Clay, Sr.
- 1968 – Missouri’s 1st congressional district (D) – won
- 1970 – Missouri’s 1st congressional district (D) – won
- 1972 – Missouri’s 1st congressional district (D) – won
- 1974 – Missouri’s 1st congressional district (D) – won
- 1976 – Missouri’s 1st congressional district (D) – won
- 1978 – Missouri’s 1st congressional district (D) – won
- 1980 – Missouri’s 1st congressional district (D) – won
- 1982 – Missouri’s 1st congressional district (D) – won
- 1984 – Missouri’s 1st congressional district (D) – won
- 1986 – Missouri’s 1st congressional district (D) – won
- 1988 – Missouri’s 1st congressional district (D) – won
- 1990 – Missouri’s 1st congressional district (D) – won
- 1992 – Missouri’s 1st congressional district (D) – won
- 1994 – Missouri’s 1st congressional district (D) – won
- 1996 – Missouri’s 1st congressional district (D) – won
- 1998 – Missouri’s 1st congressional district (D) – won
William Lacy Clay, Jr.
- 2000 – Missouri’s 1st congressional district (D) – won
- 2002 – Missouri’s 1st congressional district (D) – won
- 2004 – Missouri’s 1st congressional district (D) – won
- 2006 – Missouri’s 1st congressional district (D) – won
- 2008 – Missouri’s 1st congressional district (D) – won
- 2010 – Missouri’s 1st congressional district (D) – won
- 2012 – Missouri’s 1st congressional district (D) – won
- 2014 – Missouri’s 1st congressional district (D) – won
- 2016 – Missouri’s 1st congressional district (D) – won
- 2018 – Missouri’s 1st congressional district (D) – won
Ben James Clayburgh
- 1994 – United States Senate (North Dakota) (R) – lost
Richard S. Clayburgh
- 2002 – North Dakota’s at large congressional district (R) – lost
Harold K. Claypool
- 1936 – Ohio’s 11th congressional district (D) – won
- 1938 – Ohio’s 11th congressional district (D) – won
- 1940 – Ohio’s 11th congressional district (D) – won
- 1942 – Ohio’s 11th congressional district (D) – lost
Harold Kile Claypool
- 1964 – Texas’ 21st congressional district (R) – lost
Benjamin M. Clayton
- 1928 – Illinois’ 1st congressional district (I) – lost
Eva M. Clayton
- 1992 – North Carolina’s 1st congressional district (D) – won
- 1994 – North Carolina’s 1st congressional district (D) – won
- 1996 – North Carolina’s 1st congressional district (D) – won
- 1998 – North Carolina’s 1st congressional district (D) – won
- 2000 – North Carolina’s 1st congressional district (D) – won
J. Herman Clayton
- 1920 – Illinois’ 25th congressional district (D) – lost
John Clayton
- 1994 – Georgia’s 2nd congressional district (R) – lost
Mark E. Clayton
- 2012 – United States Senate (Tennessee) (D) – lost
Powell Clayton
- 1924 – Arkansas’ 5th congressional district (R) – lost
Christopher J. Claytor
- 2002 – Texas’ 27th congressional district (L) – lost
- 2004 – Texas’ 27th congressional district (L) – lost
- 2006 – Texas’ 3rd congressional district (L) – lost
- 2008 – Texas’ 3rd congressional district (L) – lost
- 2010 – Texas’ 3rd congressional district (L) – lost
- 2018 – Texas’ 3rd congressional district (L) – lost
- 2020 – Texas’ 3rd congressional district (L) – lost
- 2022 – Texas’ 3rd congressional district (L) – lost
Edgar Cleamons
- 1934 – Oklahoma’s at large congressional district (S) – lost
Brenda Cleary
- 2014 – North Carolina’s 13th congressional district (D) – lost
James J. Cleary
- 1994 – New Jersey’s 7th congressional district (LaRouche Was Right) – lost
Susan Cleary
- 2000 – New York’s 11th congressional district (R, School Choice) – lost
- 2002 – New York’s 11th congressional district (R, IND) – lost
Warren P. Cleary
- 1962 – Michigan’s 11th congressional district (D) – lost
William Edward Cleary
- 1920 – New York’s 8th congressional district (D) – lost
- 1922 – New York’s 8th congressional district (D) – won
- 1924 – New York’s 8th congressional district (D) – won
