From my understanding the caucuses involve a bunch of people in a room standing around in groups according to which candidate they support, and trying to convince people in other groups to join their group. After a period of time, they're told to stop, the numbers in each group are tallied, and representatives of each level of support are then sent as delegates to the next level of the caucus (though they're somewhat bound at the later caucuses to that of the first level).
However it works, it's bloody confusing.
http://en.wikipedia.org/wiki/Iowa_caucus
Enivisaging the conversation when Bremer was attemping to persuade the Ayatollah Sistani of the merits of a caucus as the means of electing the Iraqi transitional government back in 2004? .... no wonder Sistani ended up adopting one vote one value and proportional representation in preference?
Was this deep deep CIA black psy-ops do we think? If so will have to revise my opinion of the competence of G Tenet.