Republican Iowa Caucus results since 1976
Republicans
2008 – Mike Huckabee (34%), Mitt Romney (25%), Fred Thompson (13%), John McCain (13%), Ron Paul (10%), Rudy Giuliani (4%), and Duncan Hunter (1%)
2004 – George W. Bush (unopposed)
2000 – George W. Bush (41%), Steve Forbes (31%), 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 Pierre 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
http://en.wikipedia.org/wiki/Iowa_caucuses#Past_winners