Invitations to the Dinner Tonight

Does anyone know who made up the quest list for tonight's dinner? Was there some type of waiting list so that in case certain people like Harry Reid turned down the invitation the next person would get to go to the dinner? I was wondering if Robin Roberts is a Republican in that the list seemed to be Repubican heavy. I thought maybe by knowing how people were chosen I could find out if Roberts was a Republican. I only knew of a few Democrats on the list, but I noticed a number of Republicans. Maybe it was just that ABC was able to get a few invites in that both Robin Roberts and Elizabeth Hasselback work for ABC. So who made up the guest list and how where people chosen?