Milliam A. Mayer
- 1936 – Delaware’s at large congressional district (S) – lost
Nancy J. Mayer
- 1996 – United States Senate (Rhode Island) (R) – lost
Fred Mayers
- 1960 – Michigan’s 18th congressional district (SL) – lost
Lawrence S. Mayers
- 1944 – New York’s 20th congressional district (R) – lost
Richard Mayers
- 2018 – Illinois’ 3rd congressional district (I-W/I) – lost
H. M. Mayes
- 1920 – Arkansas’ 1st congressional district (R) – lost
Josephine U. Mayes
- 1946 – New York’s 2nd congressional district (D, American Labor) – lost
Richard T. Mayes
- 1948 – New York’s 2nd congressional district (D, Liberal, American Labor) – lost
Philip Mayeux
- 1996 – Mississippi’s 5th congressional district (NL) – lost
- 1998 – Mississippi’s 5th congressional district (NL) – lost
Darius Mayfield
- 2022 – New Jersey’s 12th congressional district (R) – lost
Earle Bradford Mayfield
- 1922 – United States Senate (Texas) (D) – won
James L. Mayfield
- 1975 – California’ 37th congressional district (Special) (D) – lost
Don Mayhall
- 1966 – Alabama’s 8th congressional district (R) – lost
Stanley W. Mayhew
- 1946 – Connecticut’s 4th congressional district (S) – lost
- 1948 – Connecticut’s 4th congressional district (S) – lost
- 1952 – Connecticut’s 4th congressional district (S) – lost
- 1954 – Connecticut’s 4th congressional district (S) – lost
Philip Z. Maymin
- 2006 – Connecticut’s 4th congressional district (L) – lost
Elliott E. Maynard
- 2010 – West Virginia’s 3rd congressional district (R) – lost
James E. Maynard
- 1928 – Virginia’s 3rd congressional district (I) – lost
Jim Maynard
- 2004 – Tennessee’s 9th congressional district (W/I) – lost
- 2012 – United States Senate (Tennessee) (W/I) – lost
Robert Maynard
- 1998 – Vermont’s at large congressional district (L) – lost
Thomas L. Maynard
- 1966 – Maine’s 1st congressional district (I) – lost
Wiley Mayne
- 1966 – Iowa’s 6th congressional district (R) – won
- 1968 – Iowa’s 6th congressional district (R) – won
- 1970 – Iowa’s 6th congressional district (R) – won
- 1972 – Iowa’s 6th congressional district (R) – won
- 1974 – Iowa’s 6th congressional district (R) – lost
Chris Mayo
- 2014 – Indiana’s 7th congressional district (L) – lost
James Earl Mayo
- 2014 – Louisiana’s 5th congressional district (D) – lost
Jesse M. Mayo
- 1944 – California’s 2nd congressional district (R) – lost
William Benson Mayo
- 1922 – United States Senate (Vermont) (D) – lost
Frederick O. Mayock
- 2016 – Massachusetts’ 1st congressional district (I) – lost
William A. Mayor
- 1934 – Delaware’s at large congressional district (S) – lost
Steven M. Mayoras
- 2016 – Indiana’s 4th congressional district (L) – lost
George F. Mays
- 2008 – Ohio’s 5th congressional district (D) – lost
Mark Mays
- 2008 – Washington’s 5th congressional district (D) – lost
Marshall Mays
- 1980 – United States Senate (South Carolina) (R) – lost
Robert Mays (Illinois)
- 1972 – Illinois’ 23rd congressional district (R) – lost
Robert Mays (Michigan)
- 1990 – Michigan’s 1st congressional district (NPA) – lost
Harry Mayville
- 1934 – Minnesota’s 5th congressional district (I) – lost
Fred Mazelis
- 1984 – United States Senate (Michigan) (Workers League) – lost
Charles Mazer
- 1928 – Pennsylvania’s 1st congressional district (S) – lost
Stephen Mazur
- 1978 – Pennsylvania’s 6th congressional district (R) – lost
Victor Mazziotti
- 1994 – Pennsylvania’s 15th congressional district (Patriot) – lost
Romano Louis Mazzoli
- 1970 – Kentucky’s 3rd congressional district (D) – won
- 1972 – Kentucky’s 3rd congressional district (D) – won
- 1974 – Kentucky’s 3rd congressional district (D) – won
- 1976 – Kentucky’s 3rd congressional district (D) – won
- 1978 – Kentucky’s 3rd congressional district (D) – won
- 1980 – Kentucky’s 3rd congressional district (D) – won
- 1982 – Kentucky’s 3rd congressional district (D) – won
- 1984 – Kentucky’s 3rd congressional district (D) – won
- 1986 – Kentucky’s 3rd congressional district (D) – won
- 1988 – Kentucky’s 3rd congressional district (D) – won
- 1990 – Kentucky’s 3rd congressional district (D) – won
- 1992 – Kentucky’s 3rd congressional district (D) – won
Thomas McAboy, Jr.
- 1972 – Alabama’s 1st congressional district (Nat. Dem.) – lost
David L. McAdam
- 1964 – New York’s 37th congressional district (Liberal) – lost
Kathleen A. McAdam
- 1976 – New Jersey’s 10th congressional district (L) – lost
Benjamin Michael McAdams
- 2018 – Utah’s 4th congressional district (D) – won
- 2020 – Utah’s 4th congressional district (D) – lost
Ryan McAdams
- 2018 – Virginia’s 4th congressional district (R) – lost
Scott T. McAdams
- 2010 – United States Senate (Alaska) (D) – lost
Matt McAdoo
- 2006 – Texas’ 31st congressional district (L) – lost
William Gibbs McAdoo, Jr.
- 1932 – United States Senate (California) (D) – won
Al McAffrey
- 2014 – Oklahoma’s 5th congressional district (D) – lost
- 2016 – Oklahoma’s 5th congressional district (D) – lost
Donna M. McAleer
- 2012 – Utah’s 1st congressional district (D) – lost
- 2014 – Utah’s 1st congressional district (D) – lost
John R. McAlister
- 2000 – United States Senate (Ohio) (L) – lost
