The Iowa Caucuses have become almost as big a media event as Super Tuesday.
But how important really are the Iowa caucuses? How many Iowa caucus winners have actually gone on to win their party's nomination for president?
Here's a clue: It's not as many as you might think.
See also: Iowa Caucus Results
Republican voters in Iowa have sided with their party's eventual nominees only half the time in the six competitive races since 1976, according to caucus records. Democratic voters in that state, on the other hand, have fared much better, supporting all but a couple of the eventual nominees since 1972.
So where has Iowa gone wrong? Which Iowa caucus winners failed to seal the deal for their party's presidential nomination? Here's a look at five Iowa caucus winners since 1972 who turned out to be losers in that year's presidential nomination contest.