When one gets into the guts of delegate selection for the GOP convention, over 500 delegates are party officials or elected officals like Senators and such. They are locked into unelected slots from their respective states.
Heck, 90 percent of them must be Romney supporters so he starts the whole process with a big jump.
The GOP (Republican National Committee) has decreed that early contests are proportional in delegate allocation and is allowing later contests in places like Connecticut and New York (RINOland) to be winner take all.
I don’t have a link handy, but search “Green Papers” and you will find a site that details the process in each party for primaries, cacucuses and delegate selection etc.
You don’t need to send me a link to those details to know that the whole GOP animal is corrupt.