2008 - Hillary Rodham Clinton (39.1%) Barack Obama* (36.5%) John Edwards (16.9%) Bill Richardson (4.6%) Dennis J. Kucinich (1.4%) Joseph R. Biden Jr. (0.2%) Mike Gravel (0.1%) Christopher J. Dodd (0.1%)

2004 - John Kerry* (38.4%) Howard Dean (26.4%) Wesley K Clark (12.4%) John Edwards (12.0%) Joseph Lieberman (8.6%) Dennis Kucinich (1.4%) Al Sharpton (0.2%)

2000 - Al Gore* (50.4%) Bill Bradley (46.3%)

1996 - Bill Clinton* (unopposed)

1992 - Paul E. Tsongas 33.2% Bill Clinton* (24.8%) Bob Kerrey (11.1%) Tom Harkin (10.2%) Jerry Brown ( 8.0%)

1988 - Michael Dukakis* ( 36.4%) Dick Gephardt (20.3%) Paul Simon (17.4%) Jesse Jackson (8.0%) Al Gore (6.9%)
Bruce Babbitt (4.7%) Gary Hart (4.0%)

1984 - Gary Hart (37.3%) Walter F. Mondale* (27.9%) John Glenn (12.0%) Jesse Jackson (5.3%) George McGovern (5.2%) Ronald Reagan (5.0%) Ernest F. Hollings (3.5%) Alan M. Cranston (2.1%) Reubin Askew (1.0%)

1980 - Jimmy Carter* (47.1%) Edward M. Kennedy (37.3%) Edmund G. Brown, Jr. (9.6%)

1976 - Jimmy Carter* (28.4%) Morris K. Udall (22.7%) Birch Bayh (15.2%) Fred R. Harris (10.8%) R. Sargent Shriver (8.2%) Hubert Humphrey (5.6%) Henry M. Jackson (2.3%) George Wallace (1.3%)

1972 - Edmund S. Muskie (46.4%) George McGovern* (37.1%) Sam Yorty (6.1%) Wilbur Mills (4%) Vance Hartke (2.7%)

1968 - Lyndon Johnson* (49.6%) Eugene McCarthy (41.4%) Richard M. Nixon (4.6%)

1964 - Lyndon Johnson* 29,317 95.3% All others (4.7%)

1960 - John F. Kennedy* (85.2%) All others (14.8%)

1956 - Estes Kefauver (86.4%) Adlai E. Stevenson* All others (13.6%)

1952 - Estes Kefauver (55.0%) Harry S. Truman (44.2%) Adlai E. Stevenson*

*Went on to win nomination

2008 - John McCain* (37.1%) Mitt Romney (31.6%) Mike Huckabee (11.2%) Rudolph W. Giuliani (8.6%) Ron Paul (7.7%) Fred D. Thompson (1.2%) Duncan Hunter (0.5%) Alan Keyes (0.1%)

2004 - George W. Bush* (unapposed)

2000 - John McCain (49%) George W. Bush* (30.2%) Steve Forbes (12.6%), Alan Keyes (6.4%), Gary Bauer (.7%)

1996 - Pat Buchanan (27.2%) Bob Dole* (26.2%) Lamar Alexander (22.6) Steve Forbes (12.2%) Richard Lugar (5.2%) Alan Keyes (2.7%) Morry Taylor (1.4%)

1992 - George Bush* (53.2%) Patrick J. Buchanan (36.5%)

1988 - George Bush* (37.8%) Bob Dole (28.6%) Jack Kemp (12.7%) Pierre S. DuPont (10.7%) Pat Robertson (9.4%)

1984 - Ronald Reagan* (unopposed)

1980 - Ronald Reagan* (49.6%) George H.W. Bush (22.7%) Howard H. Baker (12.1%) John B. Anderson (9.8%) Philip M. Crane (1.8%) John B. Connally (1.5%)

1976 - Gerald R. Ford* (49.4%) Ronald Reagan (48.0%)

1972 - Richard M. Nixon* (67.6%) Paul M. McCloskey, Jr. (19.8%) John M. Ashbrook (9.7%)

1968 - Richard M. Nixon* (77.6%) Nelson Rockefeller (10.8%) Eugene McCarthy (5.3%) Lyndon Johnson (1.7%)
George Romney (1.7%)

1964 - Henry Cabot Lodge (35.5%) Barry M. Goldwater* (22.3%) Nelson A. Rockefeller (21.0%) Richard M. Nixon (16.8%)

1960 - Richard M. Nixon* (89.3%) Nelson Rockefeller (3.8%) Paul C. Fisher (3.3%) John F. Kennedy (3.0%)

1956 - Dwight D. Eisenhower* (98.9%) All others (1.1%)

1952 - Dwight D. Eisenhower* (50.4%) Robert A. Taft (38.7%) Harold E. Stassen (7.1%) Douglas MacArthur (3.5%)

*Went on to win nomination