It occurs to me, looking at this image of the voting for Republican
Presidential Candidate

that they really, really need a better voting system.
Beause the aim of the Caucuses is to get a candidate that The Republican
Party can stand behind, and so far what they've got is a candidate that
less than 25% are willing to definitively vote for.
Using AV you'd know whether the Gingrich voters would all move to Romney,
or if they'd rather split off to Ron Paul and put him in the lead. Is the
vote going to split 50% "Romney", 50% "Anyone but Romney", or is it nearer
25%/75%? Would a load more people really have vote for Huntsman, if only
they hadn't thought he was doomed?
What you've got is a lot of money being spent and a lot of energy being
expended, all for information that's not at all clear. Thank goodness that
this time around it's only the Republicans that are doing it.