UPDATE

Biden still has 6 delegates

Edwards now has 10, down from 11

Obama now has 21, up from 20.

Now, preference groups will select delegates to the county convention. The Obama group is in the cinema, choosing 21 delegates, etc. The county convention is Saturday, March 15. Groups can select alternates as well.

The county conventions select state convention delegates, which select national convention delegates. Each election a number of Grinnell students manage to be delegates to the national Democratic convention--often all you have to do is be persistent (or just volunteer).