Timothy I. O’Reilly
- 1954 – California’s 13th congressional district (D) – lost
William O’Reilly
- 1940 – Pennsylvania’s 7th congressional district (S) – lost
James S. O’Rourke
- 1926 – Illinois’ at large congressional district (SL) – lost
- 1928 – Illinois’ at large congressional district (SL) – lost
Jerome F. O’Rourke
- 1960 – Michigan’s 6th congressional district (D) – lost
John E. O’Rourke
- 1942 – United States Senate (Minnesota) (Special) (D) – lost
Peter O’Rourke
- 1968 – Michigan’s 14th congressional district (R) – lost
Philip A. O’Rourke
- 1954 – California’s 4th congressional district (D) – lost
Robert Francis O’Rourke
- 2012 – Texas’ 16th congressional district (D) – won
- 2014 – Texas’ 16th congressional district (D) – won
- 2016 – Texas’ 16th congressional district (D) – won
- 2018 – United States Senate (Texas) (D) – lost
Vernon O’Rourke
- 1942 – Pennsylvania’s 8th congressional district (D) – lost
- 1944 – Pennsylvania’s 7th congressional district (D) – lost
- 1946 – Pennsylvania’s 7th congressional district (D) – lost
William J. O’Rourke
- 1932 – Pennsylvania’s 4th congressional district (D) – lost
Diarmuid O’Scannlain
- 1974 – Oregon’s 1st congressional district (R) – lost
Maryellen O’Shaughnessy
- 2000 – Ohio’s 12th congressional district (D) – lost
George F. O’Shaunessy
- 1922 – Rhode Island’s 1st congressional district (D) – lost
Bernard G. O’Shea
- 1956 – United States Senate (Vermont) (D) – lost
- 1964 – Vermont’s at large congressional district (D) – lost
- 1970 – Vermont’s at large congressional district (D) – lost
George J. O’Shea, Jr.
- 1962 – Massachusetts’ 6th congressional district (D) – lost
John J. O’Shea
- 1996 – New York’s 3rd congressional district (RTL) – lost
Robert S. O’Shea
- 1972 – Illinois’ 20th congressional district (D) – lost
Shaemas O’Sheal
- 1940 – New York’s 18th congressional district (American Labor) – lost
Daniel F. O’Sullivan, Jr.
- 1996 – Missouri’s 1st congressional district (R) – lost
Eugene Daniel O’Sullivan
- 1934 – United States Senate (Nebraska) (W/I) – lost
- 1948 – Nebraska’s 2nd congressional district (D) – won
- 1950 – Nebraska’s 2nd congressional district (D) – lost
Frank P. O’Sullivan
- 1954 – California’s 15th congressional district (D) – lost
Humphrey O’Sullivan
- 1924 – Massachusetts’ 5th congressional district (D) – lost
Jeremiah J. O’Sullivan
- 1934 – Massachusetts’ 5th congressional district (D) – lost
Kevin O’Sullivan
- 1994 – Massachusetts’ 3rd congressional district (D) – lost
O’Sullivan
- 1924 – Connecticut’s 5th congressional district (Prog.) – lost
Patrick Brett O’Sullivan
- 1922 – Connecticut’s 5th congressional district (D) – won
- 1924 – Connecticut’s 5th congressional district (D) – lost
William J. O’Sullivan, Jr.
- 1980 – New Jersey’s 15th congressional district (R) – lost
Donald Lawrence O’Toole
Phelim O’Toole
Thomas J. O’Toole
Thomas P. O’Toole
Mary Rose Oakar
- 1976 – Ohio’s 20th congressional district (D) – won
- 1978 – Ohio’s 20th congressional district (D) – won
- 1980 – Ohio’s 20th congressional district (D) – won
- 1982 – Ohio’s 20th congressional district (D) – won
- 1984 – Ohio’s 20th congressional district (D) – won
- 1986 – Ohio’s 20th congressional district (D) – won
- 1988 – Ohio’s 20th congressional district (D) – won
- 1990 – Ohio’s 20th congressional district (D) – won
- 1992 – Ohio’s 10th congressional district (D) – lost
Dave Oakes
- 1964 – Texas’ 9th congressional district (R) – lost
James Oakes
- 1938 – New York’s 38th congressional district (S) – lost
Paul R. Oakes
- 1966 – Indiana’s 11th congressional district (R) – lost
Ted E. Oakes
- 1974 – Kansas’ 3rd congressional district (American) – lost
F. K. Oakley
- 1920 – New York’s 3rd congressional district (Proh.) – lost
- 1922 – New York’s 3rd congressional district (Proh.) – lost
Charles Gibb Oakman
- 1952 – Michigan’s 17th congressional district (R) – won
- 1954 – Michigan’s 17th congressional district (R) – lost
Dave Oaks
- 1962 – Texas’ 9th congressional district (R) – lost
Rob Oates
- 2012 – Idaho’s 1st congressional district (L) – lost
Barack Hussein Obama II
- 2004 – United States Senate (Illinois) (D) – won
Richard D. Obenshain
- 1964 – Virginia’s 3rd congressional district (R) – lost
Karl L. Oberhue
- 1922 – Missouri’s 5th congressional district (SL) – lost
- 1932 – United States Senate (Missouri) (SL) – lost
- 1938 – United States Senate (Missouri) (SL) – lost
- 1940 – Missouri’s 5th congressional district (SL) – lost
- 1944 – Missouri’s 4th congressional district (SL) – lost
Charles Oberkirsh
- 1936 – New York’s 9th congressional district (Comm.) – lost
Charles Monroe Oberly III
- 1994 – United States Senate (Delaware) (D) – lost
Edward Oberly
- 1922 – Michigan’s 1st congressional district (FL) – lost
Theresa Nangle Obermeyer
- 1996 – United States Senate (Alaska) (D) – lost
Michael Edward Obermueller
- 2012 – Minnesota’s 2nd congressional district (DFL) – lost
- 2014 – Minnesota’s 2nd congressional district (DFL) – lost
Jay Phillip Obernolte
- 2020 – California’s 8th congressional district (R) – won
- 2022 – California’s 23rd congressional district (R) – won
Bill Oberst, Jr.
- 1992 – South Carolina’s 1st congressional district (D) – lost
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