Yes, the process is different for Democrats than Republicans.
My understanding of the Democratic primary is that it is winner take all. The Democrats also allow independents to vote in their primary.
I had heard this too - that 80% of Iowa Republicans still think that Bush is doing a good job.
What I later found out, is that it is 80% of Iowa Republicans WHO ANSWERED THE REPUBLICAN PREFERENCE POLL who think this way. This is why the polls show Ron Paul doing poorly - they are polling...