A reader noted that he saw no Republicans in the photos or videos from the Stephen Colbert brunch, and he’s absolutely right.
The invitations to the event were sent out by Dwight Drake, and seemed to include a lot of his friends. Beyond that, it was staged as though "Candidate" Colbert were making a pitch to S.C. Democrats to let him onto the ballot for the state’s presidential primary.
Dwight had hinted ahead of time that one Republican would be there for a special presentation, but it didn’t work out because the GOP token had a family emergency.
See the above video as a partial guide to who was there. At bottom, you’ll see a clip that shows Colbert making his "pitch" to the party honchos.