Past winners
Candidates in 
bold eventually won their party's nomination. Candidates in 
italics subsequently won the general election.
Democrats
- January 3, 2008 - Barack Obama (38%), John Edwards (30%), Hillary Clinton (29%), Bill Richardson (2%), Joe Biden (1%), Chris Dodd 0%, Mike Gravel 0%, and Dennis Kucinich 0%[12]
 
- January 19, 2004 - John Kerry (38%), John Edwards (32%), Howard Dean (18%), Dick Gephardt (11%), and Dennis Kucinich (1%)
 
- January 24, 2000 - Al Gore (63%) and Bill Bradley (37%)
 
- February 12, 1996 - Bill Clinton (unopposed)
 
- February 10, 1992 - Tom Harkin (76%), "Uncommitted" (12%), Paul Tsongas (4%), Bill Clinton (3%), Bob Kerrey (2%), and Jerry Brown (2%)
 
- February 8, 1988 - Dick Gephardt (31%), Paul Simon (27%), Michael Dukakis (22%), and Bruce Babbitt (6%)
 
- February 20, 1984 - Walter Mondale (49%), Gary Hart (17%), George McGovern (10%), Alan Cranston (7%), John Glenn (4%), Reubin Askew (3%), and Jesse Jackson (2%)
 
- January 21, 1980 - Jimmy Carter (59%) and Ted Kennedy (31%)
 
- January 19, 1976 - "Uncommitted" (37%), Jimmy Carter (28%) Birch Bayh (13%), Fred R. Harris (10%), Morris Udall (6%), Sargent Shriver (3%), and Henry M. Jackson (1%)
 
- January 24, 1972 - "Uncommitted" (36%), Edmund Muskie (36%), George McGovern (23%), Hubert Humphrey (2%), Eugene McCarthy (1%), Shirley Chisholm (1%), and Henry M. Jackson (1%)[13]
 
Republicans
- 2008- Mike Huckabee (34%), Mitt Romney (25%), Fred Thompson (13%), John McCain (13%), Ron Paul (10%), Rudy Giuliani (4%), and Duncan Hunter (1%) *95% of precincts reporting [1]
 
- 2004- George W. Bush (unopposed)
 
- 2000- George W. Bush (41%), Steve Forbes (30%), Alan Keyes (14%), Gary Bauer (9%), John McCain (5%), and Orrin Hatch (1%)
 
- 1996- Bob Dole (26%), Pat Buchanan (23%), Lamar Alexander (18%), Steve Forbes (10%), Phil Gramm (9%), Alan Keyes (7%), Richard Lugar (4%), and Morry Taylor (1%)
 
- 1992- George H. W. Bush (unopposed)
 
- 1988- Bob Dole (37%), Pat Robertson (25%), George H. W. Bush (19%), Jack Kemp (11%), and Pete DuPont (7%)
 
- 1984- Ronald Reagan (unopposed)
 
- 1980- George H. W. Bush (32%), Ronald Reagan (30%), Howard Baker (15%), John Connally (9%), Phil Crane (7%), John B. Anderson (4%), and Bob Dole (2%)
 
- 1976- Gerald Ford and Ronald Reagan
 
Controversy
There is a debate over the effectiveness and usefulness of caucuses
in Iowa. One criticism is that the caucuses, especially the Democratic
caucus, are a step backwards from the right to a secret ballot.
Democratic caucus participants (though 
not Republicans,
whose caucuses vote by secret ballot) must publicly state their opinion
and vote, leading to natural problems such as peer pressure from fellow
neighbors and embarrassment over who his/her real pick might be.
Another criticism involves the sheer amount of participants' time these
events consume. The Iowa caucus lasts two hours, preventing people who
must work, who are sick, or must take care of their children from
casting their vote. Absentee voting is also barred, so soldiers who
come from Iowa, but must serve in the military lose their vote. The
final criticism is the complexity of the rules in terms of how one's
vote counts, as it is not a simple popular vote. Each precinct's vote
may be weighed differently due to its past voting record. Ties can be
solved by picking a name out of a hat or a simple coin toss, leading to
anger over the true democratic nature of these caucuses. 
[2] Additionally, the representation of the caucus has been questioned due to traditionally low turnout.
[3] Others question the permanent feature of having caucuses in certain states, while perpetually ignoring the rest of the country.